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Northwest Africa 13985
Basic information Name: Northwest Africa 13985
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13985
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 312 g
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 358 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 29 May 2021
Writeup from MB 110:

Northwest Africa 13985 (NWA 13985)

(Northwest Africa)

Purchased: 2020 Feb

Classification: HED achondrite (Eucrite, polymict)

History: Purchased in Mali in February 2020 by a Saharawi consortium represented by David Lehman.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Angular mineral clasts of exsolved pigeonite, calcic plagioclase, pigeonite, subcalcic augite and compositionally-zoned diogenitic orthopyroxene, plus some lithic clasts, are set in a fine grained matrix containing accessory silica polymoprh, ilmenite and stained kamacite. Lithic clasts comprise eucrites with various textures (microgabbroic, fine-grained ophitic, quench-textured) and rare diogenite (containing orthopyroxene exhibiting undulose extinction). The proportion of diogenitic material is estimated to be <5 vol.%.

Geochemistry: Pigeonite host (Fs57.9Wo13.1, FeO/MnO = 31), augite exsolution lamella (Fs21.4Wo40.3, FeO/MnO = 25), pigeonite (Fs42.1Wo 6.9, FeO/MnO = 26), subcalcic augite (Fs39.8Wo33.8, FeO/MnO = 32), diogenitic orthopyroxene (cores Fs22.3-23.2Wo1.4-2.2, FeO/MnO = 30-33, N = 2; rims Fs51.4-51.5Wo1.1-1.2, FeO/MnO = 31-33, N = 2), plagioclase (An84.8-94.9Or0.6-0.2, N = 3).

Classification: Eucrite (polymict breccia).

Specimens: 25 g including one polished thin section at UWB; remainder with Mr. D. Lehman.

Data from:
  Table 0
  Line 0:
Place of purchase:Mali
Date:P 2020 Feb
Mass (g):312
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):22.3-23.2; 51.4-51.5; 39.8; 21.4
Wollastonite (mol%):1.4-2.2; 1.1-1.2; 33.8; 40.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):25.0
Type spec location:UWB
Main mass:D. Lehman
Comments:Work name DL 1054; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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