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Northwest Africa 15237
Basic information Name: Northwest Africa 15237
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15237
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 90 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Enst achon
Recommended:  Enst achon    [explanation]

This is 1 of 13 approved meteorites classified as Enst achon.   [show all]
Search for other: Achondrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Approved 12 Nov 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15237 (NWA 15237)

(Northwest Africa)

Purchased: 2022 Mar

Classification: Enstatite achondrite

History: Purchased by Ziyao Wang in March 2022 from a dealer in Agadir, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia consisting of closely-packed clasts composed mainly of anhedral grains (mean grainsize ~0.5 mm) of enstatite and sodic plagioclase (intergrown with silica polymorph), together with secondary Fe oxide/hydroxides and accessory daubréelite, schreibersite and rare low-Ti troilite. No fresh metal or other sulfides (such as alabandite, niningerite and oldhamite) were found.

Geochemistry: Enstatite (Fs0.4-0.5Wo0.1-0.2, N = 3), plagioclase (Ab87.9-92.5An8.9-1.4Or3.2-6.1, N = 2).

Classification: Enstatite achondrite. The significant degree of terrestrial weathering in this specimen, which has resulted in an inability to analyze the Si content of fresh primary metal or the Ti and Cr contents of primary iron sulfide(s), precludes a more specific class assignment.

Specimens: 18.3 g including one polished thin section at UWB; remainder with Jiachang Yu.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2022 Mar
Mass (g):90
Pieces:1
Class:Enst achon
Shock stage:low
Weathering grade:high
Ferrosilite (mol%):0.4-0.5
Wollastonite (mol%):0.1-0.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):18.3
Type spec location:UWB
Main mass:Jiachang Yu
Comments:Work name WZY-103; 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)
Catalogs:
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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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Guchen Chen   
Ziyao Wang         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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