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Northwest Africa 15000
Basic information Name: Northwest Africa 15000
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15000
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 1700 g
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 379 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Jul 2022
Writeup from MB 111:

Northwest Africa 15000 (NWA 15000)

(Northwest Africa)

Purchased: 2021

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Craig Zlimen in 2021 from an Algerian dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Breccia composed of a variety of lithic eucrite clasts plus related crystalline debris and minor diogenitic orthopyroxene (<10 vol.%) within a fine grained matrix. Textures of lithic clasts include fine intergranular, subophitic, diabasic, gabbroic and very fine-grained equigranular (or granulitic). Minerals are low-Ca pyroxene, unexsolved pigeonite (some compositionally zoned), calcic plagioclase, subcalcic augite, augite, silica polymorph, chromite, ilmenite and troilite, plus rare fayalite and Fe metal.

Geochemistry: Diogenitic orthopyroxene (Fs20.0-22.0Wo0.9-2.6, FeO/MnO = 27-38, N = 3; Fs27.8-36.9Wo3.2-5.7, FeO/MnO = 27-40, N = 4), low-Ca pyroxene (Fs43.7-55.8Wo1.5-5.2, FeO/MnO = 30-33, N = 8), pigeonite (Fs52.1Wo10.1; Fs43.9Wo17.1; FeO/MnO = 30-32; N = 2), subcalcic augite (Fs39.2Wo22.9, FeO/MnO = 30), augite (Fs26.0Wo40.5, FeO/MnO = 29), plagioclase (An80.2-92.9Or1.1-0.2, N = 5).

Classification: Eucrite (polymict breccia).

Specimens: 24.7 g including one polished thin section at UWB; remainder with Mr. C. Zlimen.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021
Mass (g):1700
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):20.0-22.0; 47.9-55.8; 27.8-36.9; 26.0
Wollastonite (mol%):0.9-2.6; 1.5-5.1; 3.2-5.7; 40.5
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):24.7
Type spec location:UWB
Main mass:C. Zlimen
Comments:Work name ZLI067; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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