|Northwest Africa 7007|
|Basic information||Name: Northwest Africa 7007|
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7007
Observed fall: No
Year found: 2011
Country: Western Sahara
Mass: 91 g
This is 1 of 8 approved meteorites classified as Lunar (gabbro). [show all]
Search for other: Lunar meteorites
|Comments:||Approved 16 Dec 2011|
Writeup from MB 100:
Northwest Africa 7007 (NWA 7007)
Purchased: 2011 Oct
Classification: Lunar meteorite (gabbro)
History: Found near Smara, southern Morocco in September 2011, and purchased from a dealer in Zagora, Morocco by Greg Hupé in October 2011.
Physical characteristics: A single dense, rounded stone (91 g) partially coated with black fusion crust. Dark angular mineral clasts plus sparse white clasts are visible within a finer grained dark matrix. One small polymineralic gabbroic clast is exposed on the surface, and others are revealed in interior slices.
Petrography: (A. Irving and S. Kuehner, UWS) Crystal-rich regolithic breccia consisting of some larger polymineralic clasts (gabbro and ophitic basalt) and apparently related crystal debris in a sparse glassy, microvesicular matrix. Major components are anorthite, complexly-zoned subcalcic augite, ferropigeonite, and relatively large fragments composed of intergrowths of fayalite+hedenbergite+silica (typical of subsolidus inversion assemblages from primary pyroxferroite). Accessory phases include olivine, ilmenite, fayalite, hedenbergite, silica polymorph, troilite, Ni-free metal and baddeleyite (to 10 μm across within fayalitic rims on pyroxene). Matrix glass contains abundant small, round vesicles (typical of those representing trapped solar wind gases in other lunar regolith breccias).
Geochemistry: Zoned subcalcic augite [(core Fs22.5Wo31.2, Fe/Mn=46), mantles (Fs34.2-50.0Wo29.6-25.9, Fe/Mn=55-65), ferropigeonite rims (Fs66.1Wo19.7, Fe/Mn=66)], olivine (Fa42.0-44.4, Fe/Mn=86-93), fayalite (Fa98.4, Fe/Mn=78-84), plagioclase (An91.4.5-93.2Or0.5-0.3).
Classification: Achondrite (lunar, gabbro breccia). Terrestrial weathering is minimal.
Specimens: A total of 18.2 g of sample and one polished thick section are on deposit at UWS. The main mass is held by an anonymous collector.
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
|References:||Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)|
This is 1 of 162 approved meteorites from Western Sahara (plus 18 unapproved names)
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