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Northwest Africa 12835
Basic information Name: Northwest Africa 12835
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12835
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 209 g
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 269 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Oct 2019
Writeup from MB 108:

Northwest Africa 12835 (NWA 12835)

(Northwest Africa)

Purchased: 2019 Feb

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Jason Bliss in February 2019 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia consisting of eucrite clasts with intersertal to subophitic texture plus related crystalline debris. Minerals are exsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite, Ti chromite, troilite and rare zircon plus minor secondary calcite and gypsum.

Geochemistry: Orthopyroxene (Fs62.0-62.3Wo1.8-1.9, FeO/MnO = 31-32, N = 3), clinopyroxene (Fs26.7-28.3Wo44.2-42.8, FeO/MnO = 28-30, N = 3), plagioclase (An79.8-82.5Or1.1-0.7, N = 2).

Classification: Eucrite (monomict breccia).

Specimens: 20.5 g including one polished thin section at UWB; remainder with Mr. J. Bliss.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Feb
Mass (g):209
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):62.0-62.3; 26.7-31.9
Wollastonite (mol%):1.8-1.9
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.5
Type spec location:UWB
Main mass:J. Bliss
Comments:Work name JB19-1; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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