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Northwest Africa 15585
Basic information Name: Northwest Africa 15585
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15585
Observed fall: No
Year found: 2022
Country: Mali
Mass:help 57 g
Classification
  history:
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 131 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 29 Jan 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15585 (NWA 15585)

Mali

Purchased: 2022 Sep

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased by Mbark Arjdal in September 2022 from a Malian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen has a metamorphic texture and consists of interlocking angular mineral grains (0.2-4.2 mm) of predominantly exsolved pigeonite and calcic plagioclase with accessory silica polymorph, ilmenite and troilite. There is no distinct fine grained matrix.

Geochemistry: Low-Ca pyroxene host (Fs61.6-62.6Wo1.6-2.9, FeO/MnO = 31-32, N = 4), augite exsolution lamellae (Fs25.9-29.3Wo44.5-38.8, FeO/MnO = 31-33, N = 4), plagioclase (An85.8-89.9Or0.5-0.3, N = 3).

Classification: Eucrite (annealed breccia). The interlocking texture of mineral grains of differing size and the absence of matrix suggest that this is a recrystallized mineral breccia.

Specimens: 12.5 g in the form of a polished endcut at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Mali
Date:P 2022 Sep
Mass (g):57
Pieces:1
Class:Eucrite-unbr
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):61.6-62.6; 25.9-29.3
Wollastonite (mol%):1.6-2.9; 44.5-38.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):12.5
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 828; 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 Meteoritical Bulletin, no. 112, in preparation (2023)
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Geography:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 104 approved meteorites from Mali (plus 2 unapproved names)

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