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Northwest Africa 15304
Basic information Name: Northwest Africa 15304
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15304
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 393 g
Recommended:  Aubrite    [explanation]

This is 1 of 81 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Approved 12 Nov 2022
Writeup from MB 111:

Northwest Africa 15304 (NWA 15304)

(Northwest Africa)

Purchased: 2022 Feb

Classification: Enstatite achondrite (Aubrite)

History: Purchased in February 2022 from a dealer in Ouargla, Algeria, by an Algerian team represented by David Lehman.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of lithic clasts and related crystalline debris in a dark fine grained, partly fluidal matrix (sepia brown and almost opaque in thin section). The mineralogy is dominated by enstatite (exhibiting undulose extinction), which is accompanied by accessory forsterite, diopside, fluororichterite, cristobalite, alabandite, Si-bearing metal (with variable Ni and Si contents), Cr-Ti-troilite and alkali feldspathic glass (confined to the matrix).

Geochemistry: Enstatite (Fs0.0±0.0Wo0.7±0.0, N = 2), forsterite (Fa0.0±0.0, N = 2), diopside (Fs0.0-0.1Wo45.8-44.4, N = 2), fluororichterite [Na0.91Ca0.94Mg5.12K0.07Al0.02Si7.91O22F2], kamacite (Ni 5.4 wt.%, Si 0.9 wt.%; Ni 3.1 wt.%, Si 2.0 wt.%; N = 2), Si-rich metal (Ni 2.2 wt.%, Si 8.5 wt.%), Ni-rich metal (Ni 12.7 wt.%, Si 1.4 wt.%).

Classification: Aubrite (melt-matrix breccia, richterite-bearing).

Specimens: 28.5 g including a polished thin section and a polished endcut at UWB; remainder with Mr. D. Lehman.

Data from:
  Table 0
  Line 0:
Place of purchase:Ouargla, Algeria
Date:P 2022 Feb
Mass (g):393
Shock stage:low
Weathering grade:low
Fayalite (mol%):0.0±0.0
Ferrosilite (mol%):0.0±0.0; 0.0-0.1
Wollastonite (mol%):0.7±0.0; 45.8-44.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):28.5
Type spec location:UWB
Main mass:D. Lehman
Comments:Work name DL 1130; 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)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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