Meteoritical Bulletin: Entry for Northwest Africa 12011

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Northwest Africa 12011

Basic information

Name: Northwest Africa 12011
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12011
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 2.84 kg

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Eucrite-mmict
Recommended:			Eucrite-mmict [explanation]

This is 1 of 255 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 27 Oct 2018

Writeup

Writeup from MB 107:

Northwest Africa 12011 (NWA 12011)

(Northwest Africa)

Purchased: 2018 Jan

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Darryl Pitt on behalf of the Maine Mineral and Gem Museum in January 2018 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh breccia composed of gabbroic eucrite clasts (grainsize up to 0.8 mm) and related mneral debris. Minerals are exsolved pigeonite and calcic plagioclase with accessory silica polymorph, ilmenite, Ti-chromite, troilite and baddeleyite.

Geochemistry: Orthopyroxene host (Fs_59.0-59.4Wo_1.8-1.5, FeO/MnO = 31-32, N = 3), clinopyroxene exsolution lamellae (Fs_24.9-26.3Wo_43.3-42.0, FeO/MnO = 28-29, N = 2), plagioclase (An_91.8-92.0Or_0.4-0.3, N = 2).

Classification: Eucrite (monomict gabbroic breccia).

Specimens: 20.2 g including one polished thin section at UWB; remainder at MMGM.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2018 Jan
Mass (g):	2835
Pieces:	1
Class:	Eucrite-mmict
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	59.0-59.4; 24.9-26.3
Wollastonite (mol%):	1.8-1.5; 43.3-42.0
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.2
Type spec location:	UWB
Main mass:	MMGM
Comments:	Work name MVCH 340; 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)
MMGM: Maine Mineral and Gem Museum, PO Box 500, 99 Main St., Bethel, ME 04217, United States; Website (institutional address; updated 9 Jan 2020)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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