Lunar Meteorites


Breccias

Dhofar 1180 (18°54'52" N, 54°20'42" E)

Oman
Found 2005 January
Lunar (feldspathic fragmental breccia)

History: M. Farmer recovered a specimen in the Dhofar region of Oman.
Physical characteristics: The 115.2 g meteorite has an odd external shape akin to a thick-bladed talon.
Petrography: (T. Bunch and J. Wittke, NAU) The sample is a feldspathic fragmental breccia that contains a variety of lithologies set in matrix of similar materials with a preferred orientation of fragments and clasts. Mostly ferroan anorthosites with clasts of gabbroic anorthosites, anorthositic gabbros and norites, troctolites, olivine gabbros, microporphyritic and fine-grained impact-melt breccias, and rare, ophitic/subophitic basalts and symplectites of unknown provenance.
Mineral compositions and geochemistry: Anorthositic plagioclase (An94.5-98, FeO = 0.280.78 wt%); olivines (FeO/MnO = 82110), ferroan anorthosite (Fa38), norite (Fa18), olivine gabbro (Fa36.8); orthopyroxenes (FeO/MnO = 5073), ferroan anorthosite (Fs38.6Wo2.1), olivine gabbro (Fs33.4Wo4.3), ophitic basalt core (Fs40Wo11.8) and rim (Fs69.1Wo15.8).
Classification: Achondrite (lunar, feldspathic fragmental breccia). Minimal weathering.
Type specimen: A 20.6 g sample is on deposit at NAU. Farmer and Strope hold the main mass.

Dho 1180. Cross-polarized photomicrograph. Image with 9 mm. Photo © T. E. Bunch 2008


Dhofar 1428 (18°53.44' N 54°20.36' E)

Oman
Find: March 2006
Lunar (anorthositic breccia)

History and physical characteristics: A 213 g dark gray stone with little remaining fusion crust found within the desert of the Dhofar regions of Oman.
Petrography: (J. Wittke and T. Bunch NAU) Clast-rich impact melt breccia (mingled) that consists mostly of light to dark gray clasts of previously formed, plagioclase-rich breccias and white lithic and mineral clasts of anorthositic rocks and plagioclase. Minor amounts of norites, anorthositic gabbros, troctolites, and ophitic/subophitic basalts were also observed. Groundmass is composed of quench-textured silicate melt (plagioclase, pyroxenes, opaque minerals and glass) and isolated pockets of vesicular glassy melt.
Geochemistry: Anorthositic clast plagioclase (An93.8-98); norite olivine (Fa36, FeO/MnO = 104), plagioclase (An96.4), orthopyroxene (Fs28.4Wo4.1, FeO/MnO = 51); troctolite plagioclase (An95.5), olivine (Fa25.8, FeO/MnO = 89); and subophitic basalts that contain highly zoned pyroxenes (Fs14.9Wo5.1 to rims of Fs41.2Wo15.2).
Classification: Achondrite (lunar anorthositic breccia); component's shock levels range from moderate to completely melted; minimal weathering.
Specimens: A 20.7 g type sample is on deposit at NAU; Ward holds the main mass.


Jiddat al Harasis 348 (19°32'02" N 55°07'13" E)

Oman
Find: March 6, 2006
Lunar (feldspathic fragmental breccia)

History and physical characteristics: A small (18.4 g), complete stone with no remaining fusion crust was recovered from the Jiddat al Harasis region of Oman on March 6, 2006 by Robert Ward.
Petrography: (J. Wittke and T. Bunch, NAU) Clast-rich, fragmental breccia with sparse vesicles (< 0.3 mm) that is dominated by many varieties of quench-textured impact-melt breccias and plagioclase fragments. Minor amounts of anorthositic olivine gabbros, troctolites, and olivine/pyroxene fragments are also present.
Mineral compositions: Anorthositic gabbro olivine (Fa28.4-32.2, FeO/MnO = 89-98; Ca-rich pyroxenes, Fs10.1-25.7Wo40.6-13.0; plagioclase, An95.2-97.7), troctolite olivine (Fa17-24.3, FeO/MnO = 96 -103), plagioclase, An96.5.
Classification: Lunar (feldspathic fragmental breccia).
Type specimens: A total of 3.7 g is on deposit at NAU. Mr. Robert Ward is the holder of the main mass.


Northwest Africa 2995

Algeria
Found 2005
Achondrite (lunar feldspathic breccia)

History: A 538 g fully crusted and minimally weathered stone was purchased in Morocco by A. Aaronson in November 2005.
Petrography and Geochemistry: (T. Bunch and J. Wittke, NAU) The feldspathic fragmental breccia contains many highlands fine-grained lithologies. Norite: Orthopyroxene (Fs26.4Wo4; FeO/MnO = 66). Olivine basalt: Olivine (Fa87.2; FeO/MnO = 95), plagioclase (An84.7). Subophitic basalt: Ca pyroxene (Fs25-48Wo37.1-25.9), pigeonite (Fs27.8-31.7Wo15.4-9.3; FeO/MnO = 53), olivine (Fa36.3; FeO/MnO = 90), plagioclase (An97). Gabbro: Olivine (Fa34.7; FeO/MnO = 95), pigeonite (Fs28.2Wo8.9; FeO/MnO = 67), plagioclase (An94). KREEPy-like basalt: Plagioclase (Ab50Or17.4), K feldspar (Ab14.3Or83) in addition to silica, phosphate, and Fe-rich pyroxenes. Troctolite: olivine (Fa30.8; FeO/MnO = 94), plagioclase (An94.7). Granulitic impact melts: Olivine (Fa31), orthopyroxene (Fs25.2Wo3.4), plagioclase (An95). Anorthosite: (An92.7-96.8), glassy impact melts, coarse-grained mineral fragments, and a 0.350 mm-size grain of meteoritic Ni, Fe metal (Ni = 6.3, Co = 1.0 [both wt%]). In addition, the assemblage appears to be characterized by large amounts of breccias within breccias with at least four generations of brecciation observed in one centimeter-size breccia clast. Numerous shock-induced melt veins are present along large breccia clast margins as well as isolated melt pockets within clasts. Interior weathering grade is very low, all glasses are fresh, and no apparent terrestrial alteration veins were noted.
Classification: Achondrite (lunar, feldspathic breccia).
Specimens: A 21.2 g type specimen is on deposit at NAU. Aaronson holds the main mass.

NWA 2995. Photo © J Strope 2006

NWA 2995. Photo © J. Strope 2006


Northwest Africa 2996

Algeria
Find: 2006
Lunar (feldspathic breccia)

History and physical characteristics: A 968 g, partially crusted stone, was purchased in Morocco in November 2006 by Adam Aaronson and sold to a private collector in 2007. The weathered crust shows a color range of vermillion to dark brown to black. Several anorthositic clasts exposed on broken surfaces are as large as 3 cm.
Petrography: (T. Bunch and J. Wittke, NAU) This feldspathic breccia has an extensive melt matrix with prominent entrainments of tiny bubbles. Lithologies include anorthosite, medium-grained gabbros, anorthositic norites and troctolites, in addition to mineral fragments, shocked clasts, and devitrified glassy blobs.
Mineral compositions: A medium-grained gabbroic clast contains plagioclase (An92.1), olivine (Fa32.4, FeO/MnO = 110), Ca pyroxene (Fs22.4Wo19.1), chromite (Cr/(Cr+Al) = 0.61) and ilmenite (MgO = 5.3 wt%). Anorthositic norite orthopyroxene is Fs28.6Wo3.1 (FeO/MnO = 64), troctolitic olivine is Fa31.9, FeO/MnO = 104 and plagioclase clasts range from An91.8 to An97.4.
Bulk chemistry: (R. Korotev, WUSL) TiO2 = 0.68 wt%, Al2O3 = 20.7 wt%, FeO = 9.7 wt%, MgO = 8.0 wt%, Ni = 184 ppm, Sm = 4.6 ppm and Th = 1.6 ppm.
Classification: Lunar (feldspathic breccia).
Type specimen: a total of 20.3 g is on deposit at NAU. The main mass holder is anonymous.

NWA 2996. Photo © T E Bunch 2008.


Northwest Africa 2998

Algeria
Find: 2006
Achondrite (lunar anorthositic breccia)

History: Found in the southern Algerian desert in May 2006. Purchased by Aaronson in Morocco, June 2006.
Physical characteristics: Medium brown, oriented, nearly complete 163 g stone. Fresh, with very prominent flow lines.
Petrography (T, Bunch and J. Wittke, NAU): Breccia-in-breccia structure, breccia clasts are granulated or cataclastized with fine-grained to melt matrix. Vesiculated shock-melt veins and isolated glass clumps are common. Consists of partially maskelynitized plagioclase fragments (47 vol%), shock-melt anorthositic clasts (38 vol%), dark glasses (7 vol%), norites and troctolites (6 vol%), and olivine and pyroxene fragments (2 vol%). No mare components were observed.
Geochemistry: Plagioclase, An93.6-99, FeO = 0.15-0.35 wt%; olivine, Fa21.7-34.6. FeO/MnO = 79-87; orthopyroxene, Fs22.5-29.5Wo2.1-3.2, FeO/MnO = 53 -59; pigeonite, Fs49.3Wo5.2, FeO/MnO = 53; augite exsolution lamellae in pigeonite, Fs27.4Wo43.1; ferroaugite, Fs45.8Wo38.9, FeO/MnO = 28.
Bulk composition (R. Korotev, WUSL, INAA of 224-mg sample): FeO = 2.7 wt%, Ni = 60, Sm = 0.42, Th = 0.13 (all ppm).
Classification: Achondrite (lunar, anorthositc breccia).
Type specimens: A total of 20.4 g and one thin section are on deposit at NAU. The main mass holder is anonymous.

NWA 2998. Oriented surface with prominent melt flow lines. Photo © T E Bunch 2007.

NWA 2998. Cut surface (3.4 cm wide) that shows anorthositic richness. Old fracture surface on right side. Photo © T E Bunch 2007


Northwest Africa 3190

Northwest Africa
Find: 2006
Lunar (feldspathic breccia)

History and physical characteristics: A 40.7 g partially crusted, complete stone was purchased in Rissani. Morocco by A. Aaronson in December 2006. The hand specimen exhibits an abundance of large (between 0.6 and 2.1 mm in dia.) anorthositic clasts. The weathered portion of the crust is pale vermillion to light brown, fresher crust is dark gray to black.
Petrography (T. Bunch and J. Wittke, NAU; A. Irving, UWS): This mingled breccia contains anorthositic lithologies that include anorthosite, anorthositic norites, gabbros and troctolites, in addition to variolitic and subophitic basalt clasts, breccia-within-breccia clasts, and an abundance of olivine and plagioclase fragments. Melt and fragmental matrices are heterogeneously distributed. The interior shows very low weathering effects.
Mineral compositions: Anorthositic norite orthopyroxene is Fs28.5Wo3.8, FeO/MnO = 65. An unusual olivine gabbro contains olivine (Fa26.2; FeO/MnO = 96), plagioclase (An92.3), subcalcic pyroxene (Fs21.6Wo14.4, FeO/MnO = 48), and ilmenite with 6.5 wt% MgO. Variolitic basalt has olivine (Fa35.7, FeO/MnO = 103), pigeonite (Fs24.6Wo8.7) and plagioclase (An95.5).
Bulk composition (R. Korotev, WUSL): FeO 9.6 wt%, Sm 3.9 ppm, Th 1.4 ppm, Ir 6.5 ppb.
Classification: Lunar (feldspathic breccia). Probably paired with NWA 2995.
Type specimen: A total of 8.8 g is on deposit at NAU. The main mass holder is anonymous.

NWA 3190. Main mass. Rock is 3 cm across. Photo © T. E. Bunch 2008


Northwest Africa 4503

Northwest Africa
Find: 2007
Lunar (anorthositic breccia)

History and physical characteristics: A 70 g, partially crusted stone was purchased in January 2007 by A. Aaronson and sold to a collector in July 2007. The fusion crust is dark to light brown and vermillion in translucent areas.
Petrography (T. Bunch, J. Wittke, NAU; A. Irving, UWS): This feldspathic melt breccia is dominated by very fine to medium-grained anorthositic lithologies that are typically enriched in olivine (anorthositic troctolites and gabbros) together with a large fraction of plagioclase, olivine, and exsolution-textured pyroxene fragments. Shock-melt clasts, K-, Ba-rich glasses, and fayalite-pyroxene-quartz igneous lithologies are also present. One granophyre clast shows a granophyric or micrographic texture of oriented quartz inclusions in alkali feldspar surrounded by shock-melted plagioclase. Most of the matrix is glassy and vesiculated with included mineral fragments. Weathering effects are minimal.
Mineral compositions: gabbro; olivine, Fa34.8 (FeO/MnO = 88); augite, Fs14.6Wo41.8 (FeO/MnO = 42); plagioclase, An97.6; chromite, Cr/(Cr+Al) = 0.74. Troctolite, Fa27.9 (FeO/MnO = 83). Norite orthopyroxene is Fs24.8Wo2.5 (FeO/MnO = 55), and augite is Fs20.4Wo38.9. Basaltic pyroxene fragments, host = Fs46.9Wo2.4, lamellae = Fs19.8Wo43.4. Granophyre K-feldspar is Or72Ab18.3.
Bulk chemistry (R. Korotev, WUSL): ---
Classification: Lunar (anorthositic breccia).
Type specimen: A total of 14 g is on deposit at NAU. The main mass holder is anonymous.

NWA 2995. Note visculated area at left top of image. Photo © J. H. Wittke 2008.


Northwest Africa 4819

Algeria
Find: 2006
Lunar (feldspathic breccia)

History and physical characteristics: A single 234 g crusted stone was purchased in Rissani in 2007. The crust is fresh, some areas show melt bubbles and flow. A network of thin fractures is filled with weathering products.
Petrography (T. Bunch and J. Wittke, NAU; A. Irving, UWS): This stone is very dark, well indurated, and is fine-grained with few clasts that exceed one mm in diameter. No evidence of flow orientation was observed. NWA 4819 is a regolith breccia and has two unusual characteristics for a lunar sample: (1) a relatively large amount of homogeneously distributed fine-grained metallic nickel-iron (2 wt%) and troilite (1.5 wt%) and (2) a large population of exsolution-textured pyroxene fragments. Most lithic clasts follow the ferroan anorthositic trend and include anorthosites, fine-grained anorthositic norites, gabbros, and troctolites, in addition to shock melt clasts, K-rich glass, and spherules. No intact basaltic clasts were observed and all clasts are crushed to some extent.
Mineral compositions and geochemistry: Host orthopyroxene, Fs48.9-67.5Wo2.2-4.3 (FeO/MnO = 56); exsolution lamellae, Fs24.4-41.4Wo12.3-32.9 (FeO/MnO = 60). Anorthositic norite orthopyroxene = Fs35.4Wo4.3 and plagioclase is An96.5. Anorthositic troctolite olivine = Fa28.1 (FeO/MnO = 105); pigeonite = Fs26.9Wo5.9 (FeO/MnO = 54); plagioclase = An97 and chromite Cr/(Cr+Al) = 0.80. Kamacite has a mean Ni content of 6.2 wt% and 0.77 wt% Co and taenite has a Ni compositional range of 8.2 to 23.6 wt%.
Bulk composition (R. Korotev, WUSL): 7.0% FeO, 290 ppm Ni, 3.4 ppm Sm, 12 ppb Ir, 1.5 ppm Th.
Classification: Lunar (feldspathic breccia).
Type specimen: A total of 20.3 g is on deposit at NAU. The main mass holder is anonymous.

NWA 4819. Photo © T. E. Bunch 2008


Northwest Africa 5151

Algeria
Find: 2007
Achondrite (lunar, mingled feldspathic breccia)

History and physical characteristics: A 289 g stone was purchased in Rissani, Morocco in 2007. The exterior is reddish-brown to dark gray with minor, translucent residual fusion crust.
Petrography: (J. Wittke and T. Bunch, NAU) The fragmental to melt matrix contains abundant breccia-within-breccia clasts together with typical highlands lithic components that mostly include anorthosites, noritic and troctolitic anorthosites, troctolites (olivine > 40 vol%), gabbros, granulites, cataclastic breccias, shock melt clasts, in addition to mare basalt clasts and mineral fragments. Several small to mm-size metal globules are scattered throughout the matrix. Numerous dark brown, shock-melt veins are present along large clast margins. Interior weathering grade is very low with no apparent alteration veins.
Mineral compositions: Noritic anorthosite orthopyroxene is Fs24.4Wo38 (FeO/MnO = 60), plagioclase = An94.2. Gabbro olivine is Fa34.1 (FeO/MnO = 97), plagioclase is An88.1, pigeonite is Fs27.9Wo9.2 (FeO/MnO = 55), chromite Cr/(Cr+Al) = 0.65 and Ni in metal is 5.8 to 6.6 wt%.
Bulk chemistry: (R. Korotev, WUSL) Na2O = 0.478 wt%; Sc = 16.7 ppm, Cr = 1440 ppm; FeO = 8.52 wt%; Ni = 171 ppm; Ba = 183 ppm; Th = 1.76 ppm.
Classification: Achondrite (lunar, mingled feldspathic breccia).
Type specimen: A total of 20.3 g is on deposit at NAU. The main mass holder is anonymous.


Northwest Africa 5152

Morocco
Find: 2006
Achondrite (lunar, mingled feldspathic breccia)

History and physical characteristics: A 38 g complete stone was purchased in Rissani Morocco in 2007. The dark gray fusion crust is mostly eroded away by wind ablation.
Petrography: (J. Wittke and T. Bunch, NAU) The vesiculated melt matrix regolith breccia contains an abundance of typical anorthositic lithologies that include anorthosites, anorthositic norites, troctolitic anorthosites, granulites, devitrified shock melts, breccia-in-breccias, in addition to mare basalts and mineral fragments. Interior weathering effects are minimal.
Mineral compositions: Troctolite olivine, Fa27.6 (FeO/MnO = 95); maskelynitized plagioclase fragments, An91.2-97.6, norite orthopyroxene, Fs25.5Wo3.8 (FeO/MnO = 62); subophitic basalt pigeonite, Fs29.7Wo7.8.
Bulk chemistry: (R. Korotev, WUSL) Sc = 16.8 ppm; Cr = 1460 ppm; FeO = 9.03 wt%; Ni = 210 ppm; Ir = 210 ppm.
Classification: Achondrite (lunar, mingled feldspathic breccia).
Type specimen: A total of 7.7 g are on deposit at NAU. The main mass holder is anonymous.


Northwest Africa 5153

Morocco
Find: 2007
Achondrite (lunar, mingled feldspathic breccia)

History and physical characteristics: A 50.4 g nearly complete stone was purchased in Erfoud, Morocco in January 2008. The aeolian-modified fusion crust is dark gray to reddish-brown.
Petrography: (T. Bunch and J. Wittke, NAU; Dolores Hill, UA) Fragmental to melt-matrix breccia that contains an assortment of lunar Highland's lithologies and Mare basalts and glasses. Highland components analyzed by microprobe include cataclastic gabbro, troctolite, fragments of granophyric intergrowths of K-feldspar, felsic glasses and silica. Mare components include ophitic pigeonite and olivine basalts. Interior is very fresh and lacks alteration veins.
Mineral/phase compositions: Gabbro olivine is Fa31.7 (FeO/MnO = 99) and pigeonite is Fs25.7Wo9.3 (FeO/MnO = 53). Troctolite olivine is Fa22.3 (FeO/MnO = 80), Ca-pyroxene is Fs22.1Wo17, chromite Cr/(Cr+Al) = 0.63, and granophyric K-feldspar is An14.5Or54.3 with BaO = 2.6 wt%. Mare ophitic pigeonite basalt olivine is Fa36.7 (FeO/MnO = 106), pigeonite is Fs7.1Wo13.3 (FeO/MnO = 65), and ilmenite MgO = 5.2 wt%. Olivine basalt olivine is Fa36.2 (FeO/MnO = 94) and Ca-poor pyroxene is Fs32.1Wo13.3 (FeO/MnO = 62).
Bulk chemistry: (R. Korotev, WUSL) Na2O = 0.476 wt%; Sc = 25.6 ppm; Cr = 1963 ppm; FeO = 12.72 wt%; Ni = 150 ppm; Co = 42.4 ppm and Sr = 132 ppm. Classification: Achondrite (lunar, mingled feldspathic breccia). Type specimen: Five grams and one thin section are on deposit at NAU and one thin section and 0.3 g are on deposit at UA. Mr. Darryl Pitt holds the main mass.

NWA 5153. Long dimension 4.5 cm. Photo © T. E. Bunch 2008

NWA 5153. Slice 1.9 cm long. Photo © T. E. Bunch 2008


Northwest Africa 5207

Morocco
Find: 2007
Achondrite (lunar, mingled feldspathic breccia)

History and physical characteristics: A 101 g stone was purchased in Rissani, Morocco in 2007 by A. Aaronson. The exterior is dark without the reddish-brown to gray-brown surface colors that are typical of most Northwest African lunar meteorites. The fusion crust is modified by aeolian processes.
Petrography: (T. Bunch and J. Wittke, NAU) The fragmental matrix contains a wide variety of lithic, glassy, and shocked components that mainly include plagioclase-olivine orthocumulates, recrystallized noritic and troctolitic anorthosites, anorthosites, gabbros and course to fine-grained basalts, microbreccias, shock-melted lithologies, symplectites (from pyroxferroite decomposition), very sparse Apollo-like "green glasses" (A), and irregular-shaped light to dark green glasses (B), some of which are vesicular and contain tiny metal-sulfide spherules. The interior weathering grade is very low.
Mineral/phase chemistry: Orthocumulate olivine, Fa26.5 (FeO/MnO = 96) and plagioclase, An99.3. Coarse-grained basalt olivine is Fa30; Ca-pyroxene core, Fs45.1Wo30.4 and rim, Fs62.7Wo16.8; plagioclase, An87.7. Fine-grained basalt olivine is Fa56.9 (FeO/MnO = 93); Ca-pyroxene, Fs28.5Wo34.7; plagioclase, An91.2. Green glasses (B) in wt%: SiO2 = 43.8; Al2O3 = 18.7; Cr2O3 = 0.50; TiO2 = 0.78; FeO = 12.5; MgO = 7.0; CaO = 15.2; K2O = 0.33 and Na2O = 0.58 (N = 17).
Bulk chemistry: (R. Korotev, WUSL) Na2O = 0.484 wt%; Sc = 15.52 ppm; Cr = 1065 ppm; FeO = 7.56 wt%; Co = 26.7 ppm; Ni = 233 ppm; Th = 1.26 ppm and Ba = 123 ppm.
Classification: Achondrite (lunar, mingled feldspathic breccia).
Type specimen: A total of 20 g is on deposit at NAU. The main mass holder is anonymous.

(Above) NWA 5207 main mass. Sample is 4.5 cm wide. (Below) Slice of NWA 5207. Note green glass. Slab width is 4.4 cm. Images © 2008 T. E. Bunch.


Northwest Africa 5744

Mali
Find: February 2009
Achondrite (lunar, granulitic troctolitic breccia)

History: Found near Gawa, Mali, in February 2009 and purchased from a dealer by Adam Aaronson.
Physical characteristics: A single, buff-colored, rounded stone (170 g) lacking fusion crust. Small white clasts are visible in a pale, finer grained matrix.
Petrography (A. Irving and S. Kuehner, UWS; T. Bunch, NAU): Recrystallized breccia composed mainly of plagioclase (up to 100 m) with fine-grained (<50 m) olivine, pigeonite, orthopyroxene, and accessory Ti-chromite and Ni-bearing troilite.
Geochemistry: Plagioclase (An97.9Or0.1), olivine (Fa20.7, FeO/MnO = 76.994.5), pigeonite (Fs16.6Wo9.7, FeO/MnO = 50). Bulk composition (R. Korotev, WUSL): INAA on a 185 mg fragment gave FeO 5.7 wt%, Na2O 0.25 wt%; Sc 8.3, Cr 1050, La 1.1, Sm 0.47, Eu 0.58, Yb 0.42, Th 0.15, all in ppm.
Classification: Achondrite (lunar, granulitic troctolitic breccia).
Specimens: A total of 13.1 g and two polished thin sections are on deposit at UWS; a 7.1 g of sample is at NAU. The main mass is held by an anonymous collector.


Northwest Africa 6252

Morocco
Find: 2010
Achondrite Lunar, feldspathic breccia)

History and Description: A 113g stone (NWA 6252), a 138g stone (NWA 6554) and a 29.72g stone (NWA 6555), all partially crusted and minimally weathered, were purchased in Morocco by A. Aaronson in 2010. These stone are from the same locality as NWA 2995 and other NWA 2995 pairings.
Petrographic description (T. Bunch and J. Wittke, NAU): Feldspathic breccia that contains anorthositic, noritic, gabbros, olivine basalts, troctolites, granulitic breccias, and KREEPy-like lithologies. Breccia-in-breccia structures, impact melts and vein are common. Moderately to heavily shocked, weathering grade is low.
Geochemistry: Anorthosite plagioclase, An94; olivine basalt olivine, Fa79.9 FeO/MnO = 97; norite orthopyroxene, Fs25.8Wo3.5 (FeO/MnO = 60). Bulk chemistry (R. Korotev, WUSL): Na2O, 0.39 wt%; FeO, 12.9 wt%; Sc, 27 ppm; Sm, ppm; Eu, 0.91 ppm, Th, 1.40 ppm.
Classification: Achondrite (lunar, feldspathic breccia). Paired with NWA 2995.
Specimens: 20.3 g are on deposit at NAU. An anonymous collector holds the main mass.

NWA 6252. Paired with NWA 2995. Sample is 23 mm wide. Photo © T.E. Bunch 2011


Northwest Africa 6554

Morocco
Find: 2010
Achondrite (Lunar, feldspathic breccia)

History and Description: A 113g stone (NWA 6252), a 138g stone (NWA 6554) and a 29.72g stone (NWA 6555), all partially crusted and minimally weathered, were purchased in Morocco by A. Aaronson in 2010. These stone are from the same locality as NWA 2995 and other NWA 2995 pairings.
Petrographic description (T. Bunch and J. Wittke, NAU): Same general description as given for NWA 2995 and 6252. A feldspathic breccia that contains anorthositic, noritic, gabbros, olivine basalts, troctolites, granulitic breccias, and KREEPy-like lithologies. Breccia-in-breccia structures, impact melts and vein are common. Moderately to heavily shocked, weathering grade is low.
Geochemistry: Anorthosite plagioclase An92.4-95.6; troctolite olivine, Fa32.2 (FeO/MnO = 96); olivine fragment, Fa36.6 (FeO/MnO = 89). Bulk chemistry (R. Korotev, WUSL): Na2O, 0.44 wt%; FeO, 11.3 wt%; Sc, 20 ppm; Sm, 4.11 ppm, Eu, 0.97 ppm; Th, 1.38 ppm. Classification: Achondrite (Lunar, feldspathic breccia). Paired with NWA 2995.
Specimens: 20.7 g are on deposit at NAU. An anonymous collector holds the main mass.

NWA 6554. Paired with NWA 2995. Sample is 31 mm wide. Photo © T.E. Bunch 2011


Northwest Africa 6555

Morocco
Find: 2010
Achondrite (Lunar, feldspathic breccia)

History and Description: A 113g stone (NWA 6252), a 138g stone (NWA 6554) and a 29.72g stone (NWA 6555), all partially crusted and minimally weathered, were purchased in Morocco by A. Aaronson in 2010. These stone are from the same locality as NWA 2995 and other NWA 2995 pairings.
Petrographic description (T. Bunch and J. Wittke, NAU): Same general description as given for NWA 2995 and 6252. ). A feldspathic breccia that contains anorthositic, noritic, gabbros, olivine basalts, troctolites, granulitic breccias, and KREEPy-like lithologies. Breccia-in-breccia structures, impact melts and vein are common. Moderately to heavily shocked, wearhering grade is low.
Geochemistry: Anorthosite plagioclase An93-96.5; norite orthopyroxene Fs24.3Wo3.8; KREEPy like basalt plagioclase An35.6Or19.3. Bulk chemistry (R. Korotev, WUSL): Na2O, 0.38 wt%; FeO, 12.2 wt%; Sc, 25 ppm; Sm, 3.83 ppm; Eu, 0.92 ppm; Th, 1.19 ppm.
Classification: Achondrite (Lunar, feldspathic breccia).
Specimens: 6.3g are on deposit at NAU. An anonymous collector holds the main mass.


Northwest Africa 6578

Morocco
Find: 2010
Achondrite (Lunar, granulitic anorthosite breccia)

History: A tan to gray 1638 g stone was purchased in Morocco by Adam Aaronson in 2010.
Physical characteristics: The tan surface is deeply etched in some places by desert wind abrasion, and the gray colored areas show remnant, translucent fusion crust.
Petrographic description (T. Bunch and J. Wittke, NAU; A. Irving and S. Kuehner, UWS): A fine-grained (<0.5 mm, mean grain size = 0.125 mm) partially annealed ultracataclasite (crushed matrix occupies >90 vol%). The rock is an anorthosite based on the mineral modes of (vol%): anorthite 90, pigeonite 6, olivine 2, metal and FeS 2. Numerous fine-grained (<0.02 mm) micrographic-textured patches contain pigeonite + olivine + plagioclase ± FeS and are roughly flow-oriented. In addition, glassy shock melt veins have formed sub parallel to the apparent flow direction. A few elongated clusters of wormy taenite (<0.05 mm) are interspersed with micrographic intergrowths.
Geochemistry: Plagioclase, An94-96.3; pigeonite, Fs27.7-33.4Wo12.4-14, (FeO/MnO = 73-98); olivine, Fa21.7-44 (FeO/MnO = 78-90); taenite Ni = 9.8-16.7 wt%. Shock melt glass (avg. of 3 in wt%): SiO2, 45.2; Al2O3, 28.8; CaO, 18.9; FeO, 3.86; MgO, 2.12, Na2O, 0.4; TiO2, 0.47, MnO, 0.18.
Classification: Achondrite (lunar, granulitic anorthositic breccia). This meteorite is one of the most feldspar-rich lunar specimens known (rivaling some Apollo samples), but texturally it is unique.
Specimens: A total of 20.2 g is on deposit at NAU. Mr. Adam Aaronson holds the main mass.

(Above) NWA 6578 main mass.(Below) Slice of NWA 6578. Images © 2011 T. E. Bunch.


Shişr 160 (18°20'18" N 53°20'01" E)

Zufar, Oman
Find: January 2008
Achondrite (lunar, mingled feldspathic breccia)

History and physical characteristics: A 101 g dark, fully crusted and ablation-pitted stone was found in the Zufar region of Oman by Michael Farmer in January 2008.
Petrography: (T. Bunch and J. Wittke NAU; D. Hill, UA) Fragmental to melt matrix that contains clasts of mostly anorthosites, anorthositic norites and troctolites, many of which are granulitic, gabbros, and anorthositic cataclastites. In addition, there are mare basalts, a few glassy spherules, melt clasts and breccia-in-breccia clasts. Discontinuous melt veins are common, particularly around shock-melt clasts. Weathering grade is of low level with a few thin alteration veins.
Mineral compositions: Gabbro olivine (4 clasts) is Fa25.8-49.1 (FeO/MnO = 78-84); Ca-poor pyroxene is Fs20.5-32.7Wo3.8-7.3 (FeO/MnO = 51-54) and Ca-rich pyroxene is Fs18.6Wo40.7. Mare basalt olivine is Fa53.2, host pyroxene is Fs43.3Wo4.0, exsolution lamellae are Fs18.4Wo40.7 and plagioclase is An97.4.
Bulk chemistry: (R. Korotev, WUSL) Na2O = 0.34 wt%; Sc = 7.4 ppm; Cr = 510 ppm; FeO = 4.0 wt%; Ni = 210 ppm; Sm = 0.9 ppm and Th = 0.3 ppm. Classification: Achondrite (lunar, mingled feldspathic breccia).
Type specimen: A total of 22.2 g are on deposit at NAU. The main mass holder is Mr. Darryl Pitt.

Shişr 160. Slice is 4.4 cm wide. Image © 2008 T. E. Bunch.


Basalts

Northwest Africa 032 (near 30°22' N, 5°3' W)

Morocco, near Algerian border
Found 1999 October
Lunar meteorite (olivine-pyroxene basalt)

(Above) Hand specimen; (Below) Polished slab showing olivine phenocrysts (photos courtesy of R. A. Langheinrich)

History: A stone of ~300 g was found in the desert.
Classification and mineralogy (T. Fagan, UHAW; T. Bunch and J. Wittke, NAU): olivine, pyroxene, and chromite phenocrysts occur in a groundmass of elongate, zoned pyroxene (En1-25Wo15-25) and feldspar (~An85) crystals radiating from common nucleation sites; opaque phases include elongate, skeletal ilmenite, troilite, and trace metal; olivine phenocrysts (~12 vol%) up to 300 μm are zoned from Fo65 (cores) to Fo60 (rims) and commonly have chromite inclusions; pyroxene phenocrysts (~5 vol%) are complexly zoned, with En40-50Wo20-40 and En15-25Wo10-20 domains; both olivine and pyroxene phenocrysts surrounded by Fe-rich quenched margins (olivines, ~Fo30; pyroxenes, En5-25Wo15-30); glass with ~45.7 wt% SiO2 occurs in semicontinuous shock veins up to 50 μm wide; some terrestrial weathering products are present in fractures, but primary assemblage is essentially unaltered.
Oxygen-isotopic compositions (R. Clayton, UChi): δ18O = +5.63 ‰, δ17O = +2.92 ‰.
Bulk composition (E. Jarosewich, SI): (in wt%) SiO2 = 44.7 TiO2 = 3.08; Al2O3 = 8.74; FeO = 23.0; MnO = 0.33; MgO = 8.45; CaO = 10.9; Na2O = 0.37; K2O = 0.11; H2O = 0.06.
Specimens: type specimen, about 5-6 g, contact T. Bunch, NAU; 1.1 g plus thin section, UHaw; main mass, 260 g, Radomsky.

X-ray image of NWA 032.

References

T. J. Fagan, G. J. Taylor, K. Keil, T. E. Bunch, J. H. Wittke, R. L. Korotev, B. L. Jolliff, J. J. Gillis, L.A. Haskin, E. Jarosewich, R.N. Clayton, T. Mayeda, V. A. Fernandes, R. Burgess, G. Turner, O. Eugster & S. Lorenzetti, 2002, Northwest Africa 032: Product of Lunar Volcanism: Meteoritics and Planetary Science 37:371-394.


Gabbros

Northwest Africa 773 (~26°46' N, ~12°49' W)

Western Sahara
Found 2000 September
Lunar meteorite (cumulate olivine gabbro with regolith breccia)

Photo of a sawn face of NWA 773. From Fagan et al., 2003; photo by Marvin Killgore).

History: Three stones of 359 g, 224 g and 50 g, totaling 633 g were sold to Marvin Killgore (SWML) by nomads who showed him the place of find on a flat dry desert plain near Dchira, Western Sahara.
Mineralogy and classification (T. Fagan, UHaw, M. Killgore, SWML, J. Wittke and T. Bunch, NAU): consists of two distinct lithologies, cumulate rock and regolith breccia; shock stage, S2; weathering grade, W1. Cumulate portion: modes (vol%) are olivine = 54.7, pigeonite = 24.2, augite = 5, feldspar (including minor K-feldspar) = 15.6, opaques (troilite, chromite, Fe-metal, ilmenite) = 0.5; olivine, Fa28-34, mean Fa31 (FeO/MnO = 99 ± 11 g/g); pigeonite, En64Wo11 (FeO/MnO = 53 ± 6 g/g); augite, En49Wo36 (FeO/MnO = 46 ± 6 g/g); plagioclase, An88-91; Ba-rich K-feldspar, An3Ab4Or93 with average BaO = 2.2 wt%. Breccia portion: contains fragments of cumulate portion as well as silica glass, hedenbergitic pyroxene, volcanic rocks, and unusual lithic clasts with fayalite + Ba-rich K- feldspar + silica + plagioclase; olivine and pyroxene in the breccia have a slightly wider compositional range towards lower Mg/(Mg+Fe) than in the cumulate portion of the rock.
Chemical composition (D. Mittlefehldt, JSC): KREEP-rich with strong negative Eu-anomaly.
Noble gases (O. Eugster, Physikalisches Institut, Bern): high solar wind component, 4He/20Ne = 9, indicative of regolith material.
Specimens: type specimen, 15 g, NHM; main mass SWML.

References

TJ Fagan, GJ Taylor, K Keil, TL Hicks, M Killgore, TE Bunch, JH Wittke, DW Mittlefehldt, RN Clayton, TK Mayeda, O Eugster & S Lorenzetti, 2003, Northwest Africa 773: Lunar Origin, Iron-Enrichment Trend, and Brecciation: Meteoritics and Planetary Science 38:529-554.

TJ Fagan, K Keil, GJ Taylor, TL Hicks, M Killgore, TE Bunch, JH Wittke, O Eugster, S Lorenzetti, DW Mittlefehldt, RN Clayton & T Mayeda, 2001, New Lunar Meteorite Northwest Africa 773: Dual Origin by Cumulate Crystallization and Impact Brecciation: 64th Meeting of the Meteoritical Society: Abstracts, no. 5149.


Northwest Africa 2700

Morocco
Purchased 2004
Lunar meteorite (cumulate olivine gabbro with regolith breccia)

NWA 2700. Image © T. E. Bunch, 2009.

History: A light green to dark complete stone of 31.7 g was purchased in Erfoud, Morocco, in November 2004.
Petrography and Geochemistry: (T. Bunch and J. Wittke, NAU) The specimen consists of olivine gabbro and regolith breccia lithologies. The cumulate olivine gabbro contains ~50 vol% olivine (Fa29.3-34.7; FeO/MnO = 94), pigeonite (Fs22-28.3Wo5.6-10; FeO/MnO = 52), augite (Fs13.2Wo38.5), plagioclase and minor maskelynite (An89), Ba-rich alkali feldspar (Or92An4; BaO = 8.9 wt%), Cr-spinel, ilmenite, phosphate, and troilite. The breccia lithology is dominated by small olivine gabbro fragments and also contains subvariolitic basalt clasts with zoned pyroxenes (Fs44Wo29 to Fs58Wo23; FeO/MnO = 57); plagioclase (An90); ilmenite, and Fe-rich, low-Ca pyroxene (Fs80.8Wo14); symplectites of fayalite (Fa91); hedenbergite (Fs60.3Wo32.7); silica; clear to yellow glass spherules; agglutinates, high silica fayalitic rocks (Fa95.6); ulvöspinel; K2O-rich glass (K2O = 8.8; SiO2 = 77 [both wt%]), and pure SiO2.
Classification: Achondrite (lunar, olivine gabbro with regolith breccia) where the olivine gabbro is moderately shocked and minimally weathered. Note: This sample may be paired with NWA 773.
Specimens: A 6.8 g type specimen and two thin sections are on deposit at NAU. An anonymous finder holds the main mass.

NWA 2700. Image © T. E. Bunch, 2010


Northwest Africa 2727

Morocco or Algeria
Purchased 2005 June/July
Achondrite (lunar, mare basalt/gabbro breccia)

NWA 2727. Sample width = 11 mm. Photo © T. Bunch 2006.

NWA 2727 Blow-up of lower left of above picture. Photo width = 7 mm. Photo © T. Bunch 2006.

History: Four stones of 30.6 g, 11.6 g, 64 g, and 85 g were purchased from Moroccan dealers in Erfoud for a consortium of North American collectors in June and July of 2005.
Petrography and Geochemistry: (T. Bunch and J. Wittke, NAU; A. Irving and S. Kuehner, UWS; R. Korotev, WUSL) All stones are very similar and consist of clast-dominated polymict breccias composed of >80 vol% olivine-phyric basalt and gabbroic/diabasic clasts (0.2 cm to several cm across) within a finer breccia matrix. The basalt clasts show a wide range in mineral compositions, but all contain phenocrysts of olivine (Fa28-99; FeO/MnO = 98.9) and some also have phenocrysts of pyroxferroite or chromite all in a fine-grained matrix consisting of intergrown pigeonite, pyroxferroite, K-Ba feldspar, ilmenite, merrillite, baddeleyite, troilite, silica, and glass. The gabbroic clasts range in texture from coarser-grained (>3 mm) hypidiomorphic gabbro to finer-grained (~1 mm) diabasic clasts. Both types of gabbroic lithologies consist mainly of pigeonite (Fs23.3-31.3Wo8.7-11.5; FeO/MnO = 60-69) and subhedral to anhedral olivine (Fa34.1-41; FeO/MnO = 85-99) with less abundant augite (Fs24.1-47.5Wo24.4-32.1) and partly maskelite, blocky to tabular plagioclase (An81-94). The breccia matrix consists mainly of gabbroic debris with fragments of basalt, silica polymorph, symplectites, subparallel intergrowths of anorthite + pyroxferroite + ilmenite and shock-melted material.
Bulk compositions (R. Korotev, WUSL): INAA of 11 subsamples show that they vary considerably in bulk composition, with the most Fe-rich subsample nearly indistinguishable from NWA 3160 basalt. All other subsamples are compositionally equivalent to mixtures of NWA 3160 basalt and the regolith breccia lithology of NWA 773, but with slightly lower concentrations of incompatible elements. Note: Based on petrography, mineral compositions, and bulk compositions, these stones are paired with NWA 3160 and may be paired with NWA 773.
Classification: Achondrite (lunar, mare basalt/gabbro breccia).
Specimens: A 20.2 g type specimen and two polished thin sections are on deposit at NAU. A 0.5 g type specimen is on deposit at WUSL. Oakes, Reed, Boswell, and Turecki hold the main masses.

NWA 2727. Thin section photomicrograph in plane light. Photo © T. E. Bunch 2006.

NWA 2727. Composite backscattered electron image. Scale bar at right is 1 mm. Photo © J. H. Wittke 2006.

Reference

Bunch, T. E., Wittke, J. H., Korotev, R. L. and Irving, A. J. (2006) Lunar Planet. Sci. XXXVII, #1375.


Northwest Africa 2977

Morocco or Algeria
Purchased 2005 November
Achondrite (lunar, gabbro)

NWA 2977. Photo © Farmer 2006.

NWA 2977. Backscattered image. Minerals in order of decreasing gray: plagioclase, pigeonite, olivine, chromite and ilmenite (white). Scale bar at right is 1 mm. Photo © J. H. Wittke 2006.

History: A single minimally weathered fusion-encrusted stone of 233 g was purchased from a Moroccan dealer in Tagounite, Morocco, by M. Farmer in November 2005.
Petrography and Geochemistry: (J. Wittke and T. Bunch, NAU; A. Irving, UWS) The specimen consists of a single yellow-green, relatively coarse-grained rock traversed by thin, black glass-rich veins. It is an olivine-rich, two pyroxene cumulate gabbro composed of olivine (Fa31.7; FeO/MnO = 96; 52 vol%), (Fs26.6Wo6.7; 23 vol%), augite (Fs16.2Wo29; 9 vol%), and plagioclase (An56; 14 vol%) with minor amounts of Ba-K feldspar, chromite, ilmenite, andmerrillite. Larger pigeonite grains commonly enclose equant olivine grains, which contain abundant melt inclusions (0.025-0.125 mm). Plagioclase is partially converted to maskelynite, and pyroxenes and olivine exhibit shock lamellae and undulatory extinction. Note: This specimen is identical in texture and mineral composition to the gabbro clasts in NWA 773 and NWA 2700 and thus appears to be paired with those breccia specimens.
Classification: Achondrite (lunar, gabbro); minimal weathering.
Specimens: A 20.1 g type specimen and one polished thin section are on deposit at NAU. A 0.5 g specimen is on deposit at WUSL. An anonymous owner holds the main mass.

Reference

Bunch, T. E., Wittke, J. H., Korotev, R. L. and Irving, A. J. (2006) Lunar Planet. Sci. XXXVII, #1375.