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Northwest Africa 15367
Basic information Name: Northwest Africa 15367
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15367
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 2.24 kg
Recommended:  Lunar (melt breccia)    [explanation]

This is 1 of 24 approved meteorites classified as Lunar (melt breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 4 Dec 2022
Writeup from MB 111:

Northwest Africa 15367 (NWA 15367)

(Northwest Africa)

Find: Nov 2021

Classification: Lunar meteorite (melt breccia)

History: Edwin Thompson gave a 28.4 g slice to Cascadia for classification with the following information: A single 2238 g mass was found in Nov. 2021 in or near Bassikounou, Mauritania.

Physical characteristics: Physical Characteristics: Gray, cream, and white colored clasts set in a dark gray/black background are visible on the cut face of the slice received by Cascadia, with a rough alignment of elongate clasts. The largest clast in the slice (~1.5 cm × 0.7 cm) is light gray and contains both white and dark gray/black sub-clasts.

Petrography: (M. Hutson, A. Ruzicka, D. Sheikh, Cascadia): Sample is a melt breccia consisting of sub-angular to sub-rounded lithic and mineral clasts set in a glassy matrix. Lithic clast lithologies identified in the sample are primarily highland lithologies and include: anorthosites, anorthositic troctolites, gabbroic anorthosites, and noritic anorthosites (Stoffler et al., 1980). Accessory phases include Cr-spinel and ilmenite.

Geochemistry: (M. Hutson, D. Sheikh, A. Ruzicka, Cascadia; P. Carpenter, WUSL): Average of all data: Plagioclase feldspar: Ab3.6±0.9Or0.4±0.2An96.0±0.9, N=131; Olivine: Fa32.6±7.1, Fe/Mn=94.7±8.8, N=39; Low-Ca pyroxene: Fs26.6±8.2Wo3.6±0.7, Fe/Mn=57.0±3.9, N=29; Pigeonite: Fs30.9±5.8Wo9.3±2.9, N=34; Augite: Fs14.1±5.1Wo39.6±2.9, N=27.

Classification: Lunar (melt breccia). This meteorite is best described as a lunar feldspathic melt breccia based on texture and chemistry.

Specimens: Cascadia holds 25.7 g in five pieces, as well as a polished thin section and material in an epoxy butt; Thompson holds the main mass.

Data from:
  Table 0
  Line 0:
Date:Nov 2021
Mass (g):2238
Class:Lunar (melt breccia)
Fayalite (mol%):32.6±7.1 (N=39)
Ferrosilite (mol%):26.6±8.2(N=29)
Wollastonite (mol%):3.6±0.7 (N=29)
Classifier:M. Hutson, A. Ruzicka and D. Sheikh, Cascadia
Type spec mass (g):28.4
Type spec location:Cascadia
Main mass:Thompson
Comments:Lab number CML 1519; submitted by Melinda Hutson
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
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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