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Northwest Africa 15242
Basic information Name: Northwest Africa 15242
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15242
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 184 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  EH4
Recommended:  EH4    [explanation]

This is 1 of 21 approved meteorites classified as EH4.   [show all]
Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Comments: Approved 22 Dec 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15242 (NWA 15242)

(Northwest Africa)

Purchased: 2021 Feb

Classification: Enstatite chondrite (EH4)

History: Purchased by Matthew Stream in February 2021 from a Mauritanian dealer and then sold to Shun-Chung Yang.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU.) Very small, well-formed enstatite-rich chondrules (apparent diameter 210±180 µm, N = 25) are set in a very fine grained matrix (~20 vol.%, opaque in thin section) containing Si-bearing metal, troilite, albite, silica polymorph, labradorite, daubreelite, niningerite, schreibersite and rare awaruite. Olivine is absent. Some grains of enstatite are rimmed by more ferroan low-Ca pyroxene.

Geochemistry: Enstatite (Fs1.3±0.7Wo0.6±0.3, range Fs0.2-2.7Wo0.2-1.2, N = 16), ferroan low-Ca pyroxene (Fs9.3±4.2Wo1.7±1.4, range Fs5.6-16.7Wo0.2-3.8, N = 6), albite (Ab97.3-99.6An2.1-0.0Or0.6-0.7, N = 3), labradorite (An63.1Or0.2), kamacite (Ni 5.0-5.9 wt.%, Si 3.0-3.5 wt.%, N = 5), awaruite (Ni 69.2-74.7 wt.%, Si 11.9-12.2 wt.%, N = 2).

Classification: Enstatite chondrite (EH4). The presence of more ferroan low-Ca pyroxenes is reminiscent of the range of pyroxene compositions reported in the EH3 chondrite Qingzhen.

Specimens: 23.8 g including one polished thin section at UWB; remainder with Mr. S.-C. Yang.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2021 Feb
Mass (g):184
Pieces:1
Class:EH4
Shock stage:S2
Weathering grade:W1
Ferrosilite (mol%):1.3±0.7; 9.3±4.2
Wollastonite (mol%):0.6±0.3; 1.7±1.4
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):23.8
Type spec location:UWB
Main mass:S.-C. Yang
Comments:Work name SCY-67; 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)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
BrownU: Joseph Boesenberg Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 4 Jan 2024)
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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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
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