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Northwest Africa 6861
Basic information Name: Northwest Africa 6861
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6861
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 10.3 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  CM2
Recommended:  CM2    [explanation]

This is 1 of 505 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 29 Nov 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6861 (NWA 6861)

Northwest Africa

Purchased: Feb 2011

Classification: Carbonaceous chondrite (CM2)

Petrography: Small granular and PO chondrules (composed primarily of olivine, orthopyroxene, pigeonite and augite), angular olivine grains and very sparse CAIs (to 3 mm) set in a black, fine-grained matrix composed mainly of intergrown cronstedtite-tochilinite, framboidal or porous troilite (some Ni-bearing) and taenite. One CAI is composed mainly of melilite and calcite with minor spinel.

Geochemistry: Olivine Fa0.2-51.2, orthopyroxene Fs1.4Wo0.9, pigeonite Fs1.0Wo13.8, augite Fs0.9-4.3Wo38.1-38.3.

Data from:
  MB100
  Table 1
  Line 1516:
Place of purchase:Tuscon
Date:P Feb 2011
Mass (g):10.3
Pieces:1
Class:CM2
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):0.2-51.2
Ferrosilite (mol%):1.4
Wollastonite (mol%):0.9
Classifier:A. Irving and S. Kuehner, UWS; T. Bunch
Type spec mass (g):2.1
Type spec location:UWS
Main mass:M. Bandli
Comments:B265; 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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Gregor H.   
Mirko Graul   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2061 unapproved names)

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