|Northwest Africa 4936|
|Basic information||Name: Northwest Africa 4936|
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4936
Observed fall: No
Year found: 2007
Mass: 179 g
This is 1 of 51 approved meteorites classified as Lunar. [show all]
Search for other: Lunar meteorites
Approved 18 Aug 2008|
Revised 5 Nov 2010: Corrected Schrader to JSchrader
Writeup from MB 95:
Northwest Africa 4936
Find: September 2007
Achondrite (lunar, feldspathic breccia)
History: Purchased by an anonymous dealer in Siksou, Morocco, in September 2007.
Physical characteristics: Two dark gray, mostly very fine grained stones (72 g and 107 g) exhibiting hackly fracture and lacking obvious fusion crust. The interior is very dark gray, and resembles devitrified glass with dispersed small white clasts.
Petrography (A. Irving and S. Kuehner, UWS): Both specimens are composed of small mineral clasts and sparse lithic clasts in a very fine-grained matrix (which has heterogeneous glass). Mineral clasts include anorthitic plagioclase, pigeonite, augite, sparse olivine, Mg-bearing ilmenite, kamacitic metal and troilite. Lithic clasts include troctolite and probable mare basalt.
Geochemistry: Low-Ca pyroxene (Fs25.7Wo4.6, FeO/MnO = 56.8), pigeonite (Fs42.0Wo10.2, FeO/MnO = 63.1), olivine (Fa29.1, FeO/MnO = 75.2), plagioclase (An95.4–98.2Or0.2–0.0). Bulk composition (R. Korotev, WUSL): FeO 6.1 wt%, Th 1.85 ppm.
Classification: Achondrite (lunar, feldspathic breccia).
Specimens: A total of 20.1 g, one polished thin section and one polished mount are on deposit at UWS; a further 20 g sample is on deposit at UAz. The main mass is held by JSchrader.
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
|References:||Published in Meteoritical Bulletin, no. 95, MAPS 44, 429-462 (2009)|
This is 1 of 962 approved meteorites from Morocco (plus 8 unapproved names)
Northwest Africa 5185 (NWA 5185 assigned to same meteorite as NWA 4936)|
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