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Northwest Africa 14491
Basic information Name: Northwest Africa 14491
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14491
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 30 g
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 57 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Nov 2021
Writeup from MB 110:

Northwest Africa 14491 (NWA 14491)

(Northwest Africa)

Purchased: 2019 Jun

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased by Shun-Chung Yang in June 2019 from a dealer in Guelmim, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The sample is composed of gabbroic eucrite clasts within a melt-textured matrix. The clasts contain exsolved low-Ca pyroxene and calcic plagioclase with accessory silica polymorph, ilmenite, Ti-chromite and troilite. The matrix contains the same mineral phases, with pyroxene and plagioclase as bladed grains in parallel intergrowth.

Geochemistry: Low-Ca pyroxene (Fs59.9-61.1Wo4.1-4.8, FeO/MnO = 32-33, N = 2), pigeonite (Fs58.7-58.8Wo6.7-7.7, FeO/MnO = 32, N = 2), augite (Fs29.1-32.1Wo41.8-39.6, FeO/MnO = 34-36, N = 2), fayalite (Fa75.0, FeO/MnO = 45), plagioclase (An89.8-92.7Or0.3-0.5, N = 3).

Classification: Eucrite (melt-breccia)

Specimens: 6.5 g including a polished mount at UWB; remainder with Mr. S.-C. Yang.

Data from:
  Table 0
  Line 0:
Place of purchase:Guelmim
Date:P 2019 Jun
Mass (g):30
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:low
Fayalite (mol%):75
Ferrosilite (mol%):58.7-61.1; 29.1-32.1
Wollastonite (mol%):4.1-7.7; 39.6-41.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):6.5
Type spec location:UWB
Main mass:S.-C. Yang
Comments:Work name SCY-29; 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 8138 approved meteorites from (Northwest Africa) (plus 1941 unapproved names)

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