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Northwest Africa 6867
Basic information Name: Northwest Africa 6867
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6867
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 325 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  LL3
Recommended:  LL3    [explanation]

This is 1 of 316 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 22 Oct 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 6867 (NWA 6867)

(Northwest Africa)

Purchased: 2011 Apr

Classification: Ordinary chondrite (LL3)

Petrography: (A. Irving and S. Kuehner, UWS) Unequilibrated specimen composed of relatively large (to 1 mm), well-formed chondrules in a fairly weathered matrix. Minerals are olivine, orthopyroxene, clinopyroxene, sodic plagioclase, chromite, altered kamacite and troilite.

Geochemistry: Olivine (Fa1.4-35.0; Cr2O3 in ferroan olivine 0.14-0.80 wt.%, mean 0.38 wt.%, s.d. 0.23 wt.%, N = 8), orthopyroxene (Fs2.6-24.1Wo0.2-1.5), clinopyroxene (Fs3.3-10.4Wo43.7-37.8). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave δ18O 5.764, 5.547; δ17O 3.618, 3.459; Δ17O 0.582, 0.537 per mil.

Classification: Chondrite (LL3.1). Subtype estimated to be 3.1 based on Cr2O3 range in ferroan olivine. Estimation of subtype based on chart (Fig. 15) in Grossman and Brearley (2005).

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2011 Apr
Mass (g):325
Pieces:1
Class:LL3
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):1.4-35.0 (n=10)
Ferrosilite (mol%):2.6-24.1
Wollastonite (mol%):0.2-1.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22
Type spec location:UWB
Main mass:J. Schrader
Comments:JS11-1; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 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. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6900 approved meteorites from (Northwest Africa) (plus 2035 unapproved names)

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