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Northwest Africa 10957
Basic information Name: Northwest Africa 10957
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10957
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 12.8 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  CM1/2
Recommended:  CM1/2    [explanation]

This is 1 of 25 approved meteorites classified as CM1/2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 1), CM chondrites, and CM-CO clan chondrites
Comments: Approved 17 Dec 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10957 (NWA 10957)

(Northwest Africa)

Purchased: 2016 Jun

Classification: Carbonaceous chondrite (CM1/2)

History: Purchased by Luc Labenne from a Moroccan dealer at the Ensisheim Show in June 2016.

Physical characteristics: A single, black stone (12.8 g) notable for its unusually low density and evident porosity.

Petrography: (A. Irving and S. Kuehner, UWS) Porous aggregate of very small, partly serpentinized chondrules (apparent diameter 150±100 µm) and angular mafic silicate grains (some compositionally zoned) in a fine grained matrix (deep red-brown in thin section) composed mainly of serpentine with accessory pentlandite, pyrrhotite, rare chromite and kamacite.

Geochemistry: Olivine (Fa0.9-54.5, N = 5), orthopyroxene (Fs1.0-3.9Wo3.8-5.0, N = 2).

Classification: Carbonaceous chondrite (CM1/2).

Specimens: 2.71 g including one polished thin section at UWB; remainder with Labenne.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Ensisheim
Date:P 2016 Jun
Mass (g):12.8
Pieces:1
Class:CM1/2
Shock stage:low
Weathering grade:low
Fayalite (mol%):0.9-54.5
Ferrosilite (mol%):1.0-3.9
Wollastonite (mol%):3.8-5.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):2.71
Type spec location:UWB
Main mass:L. Labenne
Comments:LL16-1; 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)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7328 approved meteorites from (Northwest Africa) (plus 1973 unapproved names)

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