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Northwest Africa 6862
Basic information Name: Northwest Africa 6862
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6862
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 39.4 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  CM2
Recommended:  CM2    [explanation]

This is 1 of 532 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 6862 (NWA 6862)

Northwest Africa

Purchased: Feb 2011

Classification: Carbonaceous chondrite (CM2)

Petrography: Small granular chondrules (composed mainly of olivine, orthopyroxene, pigeonite and augite) in a dark reddish-brown matrix composed mainly of intergrown cronstedtite-tochilinite, Cr-bearing kamacite and chromite.

Geochemistry: Olivine Fa0.4-70.3, orthopyroxene Fs1.1Wo0.9, pigeonite Fs0.9Wo5.5, augite Fs1.0-1.5Wo37.7-36.3. Oxygen isotopes (R. Tanaka, OkaU): acid-washed samples analyzed in duplicate by laser fluorination gave, respectively: δ17O = 1.139, -0.436; δ18O = 8.610, 6.867; Δ17O = -3.380, -4.042 per mil. These values plot along the trend for CM chondrites.

Data from:
  MB100
  Table 1
  Line 1517:
Place of purchase:Tuscon
Date:P Feb 2011
Mass (g):39.4
Pieces:1
Class:CM2
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):0.4-70.3
Ferrosilite (mol%):1.1
Wollastonite (mol%):0.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):8.6
Type spec location:UWS
Main mass:M. Bandli
Comments:B266; submitted by A. Irving
Plots: O isotopes:  
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)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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