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Northwest Africa 10542
Basic information Name: Northwest Africa 10542
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10542
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 240 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 179 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 27 Feb 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10542 (NWA 10542)

(Northwest Africa)

Purchased: 2013

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased by John Curchin in 2013 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of gabbroic clasts and related mineral debris in a partly vesicular matrix. The predominant minerals are exsolved pigeonite (pale orange in thin section with some red-brown patches) and calcic plagioclase (polycrystalline) with accessory silica polymorph, ilmenite and Ti-chromite, plus secondary calcite and barite.

Geochemistry: Host orthopyroxene (Fs62.2-62.6Wo3.3-4.9, FeO/MnO = 30-32, N = 3), clinopyroxene exsolution lamellae (Fs28.2-29.5Wo43.5-42.8, FeO/MnO = 32-35, N = 2), pigeonite in matrix (Fs45.9Wo20.1, FeO/MnO = 30).

Classification: Eucrite (gabbroic breccia, shocked). Paired with NWA 7989, NWA 8036, NWA 8056 and others.

Specimens: 24.1 g including one polished thin section at UWB; main mass with Mr. J. Curchin.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013
Mass (g):240
Pieces:1
Class:Eucrite-br
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):62.2-62.6; 28.2-29.5
Wollastonite (mol%):3.3-4.9; 43.5-42.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):24.1
Type spec location:UWB
Main mass:J. Curchin
Comments:JC15-7; submitted by A. Irving
Institutions
   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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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