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Northwest Africa 11956
Basic information Name: Northwest Africa 11956
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11956
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 720 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 516 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 15 Sep 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11956 (NWA 11956)

(Northwest Africa)

Purchased: 2015 Oct

Classification: Ureilite

History: Purchased by Marc Jost in October 2015 from a Moroccan dealer at the Munich Show.

Petrography: (A. Irving and S. Kuehner, UWS) Relatively coarse grained protogranular aggregate composed of subequal amounts of olivine (exhibiting reduced magnesian rims containing fine Fe metal) and polysynthetically twinned clinopyroxene (both pigeonite and augite). No evidence of microdiamond was found.

Geochemistry: Olivine (cores Fa10.8-11.0; rims Fa0.9-5.3; N = 4), low-Ca pyroxene (Fs11.0-11.1Wo4.6-4.7, N = 2), high-Ca pyroxene (Fs5.8-6.8Wo37.2-37.1, N = 2).

Classification: Ureilite.

Specimens: 27.8 g including one polished thin section at UWB; remainder with Space Jewels Switzerland.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2015 Oct
Mass (g):720
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:low
Fayalite (mol%):10.8-11.0
Ferrosilite (mol%):11.0-11.1
Wollastonite (mol%):4.6-4.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):27.8
Type spec location:UWB
Main mass:M. Jost
Comments:Work name SJS18005; 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)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7048 approved meteorites from (Northwest Africa) (plus 1998 unapproved names)

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