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Northwest Africa 14847
Basic information Name: Northwest Africa 14847
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14847
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 636 g
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 382 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Aug 2022
Writeup from MB 111:

Northwest Africa 14847 (NWA 14847)

(Northwest Africa)

Purchased: 2021 May

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Said Yousfi in May 2021 from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed predominantly of angular mineral grains (mean grainsize 0.7 mm with some grains up to 1.9 mm) related to one or more gabbroic eucrite lithologies together with some fine grained ophitic eucrite clasts and some diogenite material (< 10 vol.%). All of the plagioclase in this specimen has been converted to isotropic maskelynite. Eucritic minerals are exsolved pigeonite, maskelynite, silica polymorph, medium-Ti chromite, ilmenite, troilite (exhibiting some secondary Fe oxide alteration) and rare metal. Rare polycrystalline diogenite clasts are present, but most of the diogenitic material consists of single, zoned orthopyroxene grains with more ferroan, concentric rims. All diogenitic orthopyroxene exhibits undulose extinction.

Geochemistry: Diogenitic orthopyroxene (cores Fs24.1-25.6Wo1.8-2.0, FeO/MnO =30-33, N = 2; rims Fs49.9-50.6Wo1.9-2.6, FeO/MnO = 33, N = 2), low-Ca pyroxene host (Fs51.7Wo2.8, FeO/MnO = 32), augite exsolution lamellae (Fs21.8-24.4Wo43.7-42.4, FeO/MnO = 27-28, N = 2), maskelynite (An86.5-90.3Or0.7-0.3, N = 3).

Classification: Eucrite (polymict breccia, maskelynite-bearing).

Specimens: 24.1 g including one polished thin section at UWB; remainder with Mr. S. Yousfi.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2021 May
Mass (g):636
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):24.1-25.6; 49.9-50.6; 51.7; 21.8-24.4
Wollastonite (mol%):1.8-2.0; 1.9-2.6; 2.8; 43.7-42.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):24.1
Type spec location:UWB
Main mass:S. Yousfi
Comments:Work name SY 86; 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 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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