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Northwest Africa 12763
Basic information Name: Northwest Africa 12763
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12763
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 837 g
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 275 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Aug 2019
Writeup from MB 108:

Northwest Africa 12763 (NWA 12763)

(Northwest Africa)

Purchased: 2016 Dec

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Beat Booz in December 2016 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of microgabbroic eucrite clasts plus mineral clasts of related crystalline debris, both exhibiting some preferred dimensional orientation. Minerals are exsolved pigeonite (pale orange in thin section), calcic plagioclase (polycrystalline) together with accessory ilmenite, Ti-chromite, troilite and zircon. Minor secondary calcite is present.

Geochemistry: Low-Ca pyroxene (Fs59.7-63.4Wo3.8-5.6, FeO/MnO = 28-33, N = 3), high-Ca pyroxene (Fs25.1-27.8Wo43.0-42.5, FeO/MnO = 30-34, N = 3), plagioclase (An92.1Or0.2).

Classification: Eucrite (monomict breccia, microgabbroic, shocked)

Specimens: 21.9 g including one polished thin section at UWB; remainder with Mr. B. Booz.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016 Dec
Mass (g):837.2
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):59.7-63.4; 25.1-27.8
Wollastonite (mol%):3.8-5.6; 43.0-42.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.9
Type spec location:UWB
Main mass:B. Booz
Comments:Work name BB-55; submitted by A. Irving
   and collections
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)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Beat Booz               

     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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