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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:help 175 g
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 275 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 9 Feb 2020
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 (Fs60.7-62.0Wo3.4-1.9, FeO/MnO = 31-32, N = 5), clinopyroxene exsolution lamellae (Fs26.4-27.4Wo44.2-43.3, FeO/MnO = 31-34, N = 5), plagioclase (An88.0-90.0Or0.4, 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:
  Table 0
  Line 0:
Place of purchase:Rissani
Date:P 2019 Apr
Mass (g):175
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
   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)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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