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Northwest Africa 13983
Basic information Name: Northwest Africa 13983
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13983
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1500 g
Recommended:  Diogenite-pm    [explanation]

This is 1 of 49 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 18 Jun 2021
Writeup from MB 110:

Northwest Africa 13983 (NWA 13983)

(Northwest Africa)

Purchased: 2020 Feb

Classification: HED achondrite (Diogenite, polymict)

History: Purchased by Ziyao Wang in February 2020 from a dealer in Algiers, Algeria.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed predominantly of angular grains of compositionally-zoned diogenitic orthopyroxene plus minor anorthitic plagioclase, eucritic exsolved pigeonite and rare silica polymorph, together with sparse lithic clasts of diogenite (some plagioclase bearing) and fine-grained ophitic eucrite, set in a matrix containing kamacite, taenite, troilite, low-Ti chromite and ilmenite. Some orthopyroxene contains sparse thin exsolution lamellae of augite. The proportion of eucritic material is estimated to be only 1-2 vol.%.

Geochemistry: Diogenitic orthopyroxene (cores Fs21.3-25.1Wo1.9-4.1, FeO/MnO = 28-32, N = 4; rims Fs36.1-39.6Wo1.9-3.2, FeO/MnO = 31-32, N = 3), augite (Fs16.0±0.0Wo44.1-44.2, FeO/MnO = 23-27, N = 2), eucritic low-Ca pyroxene host (Fs53.9-55.7Wo1.6-4.5, FeO/MnO = 28-29, N = 2), augite exsolution lamella (Fs23.6Wo42.6, FeO/MnO 25), plagioclase (An87.5-93.4Or0.5-0.3, N = 3).

Classification: Diogenite (polymict breccia).

Specimens: 25.0 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  Table 0
  Line 0:
Place of purchase:Algiers
Date:P 2020 Feb
Mass (g):1500
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):21.3-25.1; 36.1-30.6; 53.9-55.7; 16.0-23.6
Wollastonite (mol%):1.9-4.1; 1.9-2.6; 1.6-4.5; 42.6-44.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):25.0
Type spec location:UWB
Main mass:WangZ
Comments:Work name WZY-17; 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)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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