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Northwest Africa 15484
Basic information Name: Northwest Africa 15484
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15484
Observed fall: No
Year found: 2022
Country: Mali
Mass:help 1786 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 658 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 20 Dec 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15484 (NWA 15484)

Mali

Find: 2022 May

Classification: Ureilite

History: Found in Mali in May 2022, purchased by Shawn Kashay from a dealer in Dchira, Morocco and subsequently sold to Preston Allen.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Protogranular aggregate (mean grainsize ~0.5 mm) of olivine, orthopyroxene and minor diopside with accessory Fe metal, schreibersite, graphite and troilite. There are sparse reduced magnesian rims accompaned by blebby Fe metal on the margins of some olivine grains or along cracks within them, as well as sporadic veinlets of kamacite. Pigeonite is absent.

Geochemistry: Olivine (cores Fa9.5-15.8, Cr2O3 0.53-0.72 wt.%, CaO 0.22-0.33 wt.%, N = 12; rim Fa3.9), orthopyroxene (Fs13.0-13.4Wo3.3-3.7, Al2O3 0.5 wt.%, Cr2O3 1.0 wt.%, TiO2 0.08 wt.%, N = 5; Fs4.1Wo4.3), diopside (Fs5.8Wo40.5).

Classification: Ureilite.

Specimens: 21.4 g including one polished thin section at UWB; remainder with Mr. P. Allen.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Warren, Ohio
Date:2022 May
Mass (g):1786
Pieces:1
Class:Ureilite
Shock stage:high
Weathering grade:low
Fayalite (mol%):9.5-15.8; 3.9
Ferrosilite (mol%):13.0-13.4; 5.8
Wollastonite (mol%):3.6-3.7; 40.5
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU.=
Type spec mass (g):21.4
Type spec location:UWB
Main mass:P. Allen
Comments:Work name SK22-2; 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:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 112 approved meteorites from Mali (plus 3 unapproved names)
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Revision
  history:
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