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Northwest Africa 11953
Basic information Name: Northwest Africa 11953
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11953
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 1160 g
Meteoritical Bulletin:  MB 107  (2018)  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 15 Sep 2018
Writeup from MB 107:

Northwest Africa 11953 (NWA 11953)

(Northwest Africa)

Purchased: 2018 Feb

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Jason Phillips in February 2018 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Highly shocked and partially melted breccia. Gabbroic-textured clasts (some up to 3 cm across) and related disaggregated debris consist mainly of extremely fine scale polycrystalline aggregates after primary pigeonite (with some exsolution lamellae still preserved) and polycrystalline, microvesicular calcic plagioclase (exhibiting "swirly" microtexture indicative of being previously molten). Accessory minerals are silica polymorph, ilmenite, Ti-chromite, Ti-poor chromite, troilite and minor secondary barite and calcite.

Geochemistry: Orthopyroxene host (Fs57.9-60.6Wo4.0-2.1, FeO/MnO = 31-34, N = 3), clinopyroxene exsolution lamellae (Fs26.9-27.3Wo41.8-42.6, FeO/MnO = 30-31, N = 2), plagioclase (An89.2-90.4Or0.9-0.4, N = 2).

Classification: Eucrite (monomict breccia, gabbroic, shock melted).

Specimens: 46.5 g including one polished thin section at UWB; remainder with Mr. J. Phillips.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018 Feb
Mass (g):1160
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):57.9-60.6; 26.9-27.3
Wollastonite (mol%):4.0-2.1; 41.8-42.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):46.5
Type spec location:UWB
Main mass:J. Phillips
Comments:Work name JP18-2; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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