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Northwest Africa 4936
Basic information Name: Northwest Africa 4936
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4936
Observed fall: No
Year found: 2007
Country: Morocco
Mass:help 179 g
Meteoritical Bulletin:  MB 95  (2009)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 98 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: 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.

Data from:
  Table 2
  Line 60:
Place of purchase:Morocco
Mass (g):179
Fayalite (mol%):29.1
Ferrosilite (mol%):25.7
Wollastonite (mol%):4.6
Classifier:UWS and/or Uaz
Type spec mass (g):40.1
Type spec location:UWS and/or Uaz
Main mass:JSchrader
Comments:Feldspathic breccia
   and collections
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)
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Photos from the Encyclopedia of Meteorites:
Randy Korotev   


     This is 1 of 1847 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)
Synonymshelp: Northwest Africa 5185 (NWA 5185 assigned to same meteorite as NWA 4936)

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