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Northwest Africa 15244
Basic information Name: Northwest Africa 15244
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15244
Observed fall: No
Year found: 2022
Country: Niger
Mass:help 776 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 280 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 5 Sep 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15244 (NWA 15244)

Niger

Purchased: 2022 Jan

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Mbark Arjdal in January 2022 from a dealer in Niger.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Fresh monomict breccia composed of lithic intergranular clasts (exhibiting some variation in grainsize) plus related crystalline debris in a sparse fine grained matrix. Major minerals are exsolved pigeonite and calcic plagioclase together with accessory unexsolved pigeonite, silica polymorph, fayalite, ilmenite, chromite, troilite and merrillite.

Geochemistry: Low-Ca pyroxene host (Fs59.5-63.4Wo1.6-3.8, FeO/MnO = 31-33, N = 7), augite exsolution lamellae (Fs26.2-27.8Wo42.9-43.5, FeO/MnO = 30-31, N = 4), plagioclase (An83.4-90.5Or0.9-0.2, N = 6), fayalite (Fa80.6, FeO/MnO = 44).

Classification: Eucrite (monomict breccia).

Specimens: 29.5 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Niger
Date:P 2022 Jan
Mass (g):776
Pieces:many
Class:Eucrite-mmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):59.5-63.4; 26.2-27.8
Wollastonite (mol%):1.6-3.8; 42.9-43.5
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):29.5
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 808; 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:

Niger
Coordinates:Unknown.

Statistics:
     This is 1 of 119 approved meteorites from Niger (plus 4 unapproved names)
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Revision
  history:
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