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Northwest Africa 16250
Basic information Name: Northwest Africa 16250
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16250
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 5.88 kg
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 106 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 25 Mar 2024
Writeup from MB 113:

Northwest Africa 16250 (NWA 16250)

(Northwest Africa)

Purchased: 2021 Jan

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased by Luc Labenne in January 2021 from a Moroccan dealer.

Petrography: (A. Irving, UWS, and P. Carpenter, WUSL) Breccia consisting of highly shocked gabbroic eucrite clasts and related debris in a sparse, partially glassy matrix exhibiting fluidal textures. The major minerals are low-Ca pyroxenes, augite and calcic plagioclase. The pyroxenes consist of myriad tiny subgrains and the plagioclase is also polycrystalline. Accessory phases include silica polymorph, ilmenite, Cr-bearing ilmenite, chromite, troilite and minor secondary barite.

Geochemistry: Low-Ca pyroxene (Fs58.3-61.8Wo5.0-2.2, FeO/MnO = 31-34, N = 3), pigeonite (Fs61.2Wo6.7; Fs48.8-56.7Wo6.3-15.1; FeO/MnO = 27-31, N = 4), augite (Fs25.8-29.3Wo42.9-43.8, FeO/MnO = 29-34, N = 5), plagioclase (An87.1-92.2Or0.8-0.3, N = 5).

Classification: Eucrite (monomict gabbroic melt-matrix breccia, highly shocked).

Specimens: 25.7 g including one polished thin section at UWB; remainder with Labenne.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021 Jan
Mass (g):5880
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):58.3-61.8; 61.2; 48.8-56.7; 25.8-29.3
Wollastonite (mol%):5.0-2.2; 6.7; 6.3-15.1; 42.9-43.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):25.7
Type spec location:UWB
Main mass:Labenne
Comments:Work name LAB23-1; 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)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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