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Northwest Africa 10540
Basic information Name: Northwest Africa 10540
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10540
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 122.7 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 238 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 27 Feb 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10540 (NWA 10540)

(Northwest Africa)

Purchased: 2015 Oct

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by John Higgins in October 2015 from a dealer in Laayoune, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of larger mineral grains (up to 2.2 mm across) within a finer matrix of the same minerals. The main components are finely exsolved pigeonite and calcic plagioclase with accessory silica polymorph, ilmenite, Ti-free chromite and troilite. Some composite grains with pyroxene and plagioclase in contact are present.

Geochemistry: Host orthopyroxene (Fs46.8-48.3Wo3.4-1.5, FeO/MnO = 31-32, N = 3), clinopyroxene exsolution lamellae (Fs17.3-19.1Wo45.3-44.6, FeO/MnO = 28, N = 3).

Classification: Eucrite (monomict gabbroic breccia).

Specimens: 26 g including one polished thin section at UWB; remaining material with Mr. J. Higgins.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Laayoune
Date:P 2015 Oct
Mass (g):122.7
Pieces:2
Class:Eucrite-mmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):46.8-48.3; 17.3-19.1
Wollastonite (mol%):3.4-1.5; 45.3-44.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):26
Type spec location:UWB
Main mass:J. Higgins
Comments:JH15-15; 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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