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Northwest Africa 14920
Basic information Name: Northwest Africa 14920
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14920
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 457 g
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 263 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 20 Jun 2022
Writeup from MB 111:

Northwest Africa 14920 (NWA 14920)

(Northwest Africa)

Purchased: 2021 Sep

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Juan Avil├ęs Poblador in September 2021 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of disaggregated mineral debris from a gabbroic eucrite lithology plus some related polymineralic lithic clasts. Major minerals are exsolved pigeonite (pale orange in thin section) and calcic plagioclase accompanied by accessory Ti-chromite, ilmenite, minor silica polymorph and altered Fe metal, plus secondary barite and calcite. Both pigeonite and plagioclase are finely polycrystalline throughout the studied thin section, and the fine grained matrix has in part a fluidal texture and is sporadically vesicular.

Geochemistry: Low-Ca pyroxene (Fs60.6-64.7Wo1.8-3.4, FeO/MnO = 30-32, N = 4), augite (Fs25.4-29.5Wo45.2-42.8, FeO/MnO = 30-32, N = 4), plagioclase (An88.4-91.5Or0.4-0.3, N = 3).

Classification: Eucrite (monomict gabbroic breccia, shock-recrystallized and partially melted).

Specimens: 23.16 g including two polished thin sections at UWB; remainder with Mr. J. Poblador.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021 Sep
Mass (g):457
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):60.6-64.7; 25.4-29.0
Wollastonite (mol%):1.8-3.4; 45.2-42.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):23.16
Type spec location:UWB
Main mass:J. Poblador
Comments:Work name JAP21-6; 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. 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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