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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
Meteoritical Bulletin:  MB 111  (2023)  Lunar (melt breccia)
Recommended:  Lunar (melt breccia)    [explanation]

This is 1 of 28 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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