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Northwest Africa 15236
Basic information Name: Northwest Africa 15236
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15236
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 262 g
Meteoritical Bulletin:  MB 111  (2023)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 414 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 5 Sep 2022
Writeup from MB 111:

Northwest Africa 15236 (NWA 15236)

(Northwest Africa)

Purchased: 2022 Feb

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Wei Jiang from a Moroccan dealer in 2021 and subsequently acquired by Ziyao Wang and Jiachang Yu in February 2022.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Complex breccia containing some lithic clasts but mostly crystalline debris derived from several different lithologies. Most of the lithic clasts are microgabbroic and composed of zoned, unexsolved pigeonite, subcalcic augite and calcic plagioclase together with fine grained symplectitic intergrowths of augite+fayalitic olivine+silica polymorph+troilite. Grains of orthopyroxene are present as a minor component (<5 vol.%) and have rims of exsolved ferroan pigeonite. Isolated angular grains of silica polymorph, ilmenite, troilite, Ni-poor Fe metal and rare zircon are also present.

Geochemistry: Basaltic clasts: low-Ca pyroxene (Fs55.3-55.6Wo2.4-5.0, FeO/MnO = 33-34, N = 2), pigeonite (Fs31.2Wo7.1, FeO/MnO = 28), subcalcic augite (Fs34.8Wo30.2; Fs52.8Wo25.4; FeO/MnO = 30; N = 2), fayalitic olivine in symplectites (Fa82.1-84.0, FeO/MnO = 41-43, N = 2), plagioclase (An85.2-89.3Or1.2-0.3, N = 3). Orthopyroxene cores (Fs27.8-28.1Wo3.3-3.5, FeO/MnO = 29-31, N =2), low-Ca pyroxene in rims (Fs49.9-54.3Wo2.1-3.4, FeO/MnO = 33, N = 2). Orthopyroxene host (Fs55.6Wo1.6, FeO/MnO = 34), augite exsolution lamellae (Fs26.4-27.6Wo37.8-42.0, FeO/MnO =30-31, N = 2). Ferroan olivine in matrix (Fa72.0, FeO/MnO = 48).

Classification: Eucrite (polymict breccia).

Specimens: 20.8 g including one polished thin section at UWB; remainder with Jiachang Yu.

Data from:
  Table 0
  Line 0:
Place of purchase:China
Date:P 2022 Feb
Mass (g):262
Shock stage:low
Weathering grade:low
Fayalite (mol%):72.0; 82.1-84.0
Ferrosilite (mol%):55.3-55.6; 31.2; 34.8-52.8; 27.8-28.1; 49.9-54.3;
Wollastonite (mol%):2.4-5.0; 7.1; 30.2-25.4; 3.3-3.5; 2.1-3.4; 1.6; 37
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.8
Type spec location:UWB
Main mass:Jiachang Yu
Comments:Work name WZY-90; 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 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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