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Northwest Africa 11381
Basic information Name: Northwest Africa 11381
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11381
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 46.7 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 315 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 15 Aug 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11381 (NWA 11381)

(Northwest Africa)

Purchased: 2016 Feb

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Eric Twelker in February 2016 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of sparse lithic eucrite clasts (with fine-intersertal, microgabbroic and diabasic textures) and related crystalline debris, plus ~5 vol.% polycrystalline diogenite and diogenitic orthopyroxene clasts, in a finer matrix. Minerals include exsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite and chromite.

Geochemistry: Diogenitic orthopyroxene (Fs27.7Wo2.0, FeO/MnO = 38), orthopyroxene host (Fs42.9-48.8Wo2.6-1.7, FeO/MnO = 28-36, N = 2), clinopyroxene exsolution lamellae (Fs18.2-20.1Wo44.1-42.1, FeO/MnO = 25, N = 2), plagioclase (An89.9-92.2Or0.5-0.4, N = 2).

Classification: Eucrite (polymict breccia).

Specimens: 9.4 g including one polished thin section at UWB; remainder with Twelker.

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2016 Feb
Mass (g):46.7
Pieces:1
Class:Eucrite-pmict
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):27.7; 42.9; 48.8; 18.2-20.1
Wollastonite (mol%):2.0; 2.6; 1.7; 44.1-42.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):9.4
Type spec location:UWB
Main mass:E. Twelker
Comments:Work name ET17-5; submitted by A. Irving
Institutions
   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)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 106, in preparation (2017)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6423 approved meteorites from (Northwest Africa) (plus 2023 unapproved names)

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