Meteoritical Bulletin: Entry for Northwest Africa 13104

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Northwest Africa 13104

Basic information

Name: Northwest Africa 13104
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13104
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 175 g

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	Eucrite-mmict
Recommended:			Eucrite-mmict [explanation]

This is 1 of 281 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 9 Feb 2020

Writeup

Writeup from MB 109:

Northwest Africa 13104 (NWA 13104)

(Northwest Africa)

Purchased: 2019 Apr

Classification: HED achondrite (Eucrite, monomict)

History: Purchased in Rissani, Morocco by Adam Aaronson in April 2019.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Monomict breccia composed of closely-packed very fine grained granulitic eucrite clasts in a sparse matrix. Minerals are exsolved pigeonite, calcic plagioclase, silica polymorph, Ti-Al-bearing chromite, troilite, ilmenite and rare zircon.

Geochemistry: Orthopyroxene host (Fs_60.7-62.0Wo_3.4-1.9, FeO/MnO = 31-32, N = 5), clinopyroxene exsolution lamellae (Fs_26.4-27.4Wo_44.2-43.3, FeO/MnO = 31-34, N = 5), plagioclase (An_88.0-90.0Or_0.4, N = 4).

Classification: Eucrite (monomict breccia, fine grained, recrystallized).

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

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Rissani
Date:	P 2019 Apr
Mass (g):	175
Pieces:	1
Class:	Eucrite-mmict
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	60.7-62.0; 26.4-27.4
Wollastonite (mol%):	3.4-1.9; 44.2-43.5
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	20.2
Type spec location:	UWB
Main mass:	A. Aaronson
Comments:	Work name M2206; 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)
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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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