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Northwest Africa 7005
Basic information Name: Northwest Africa 7005
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7005
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 225 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  CO3
Recommended:  CO3    [explanation]

This is 1 of 554 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 6 Sep 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7005 (NWA 7005)

Northwest Africa

Purchased: 2011 Sep

Classification: Carbonaceous chondrite (CO3)

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed small (to 0.3 mm) chondrules. Olivine, orthopyroxene, with accessory clinopyroxene, calcic plagioclase, troilite, pentlandite, taenite and altered kamacite. Some rounded composite metal+sulfide aggregates. Sparse small CAI composed of fine grained spinel, with varying amounts of Mg-ilmenite, grossite and corundum; some CAI have Wark-Lovering rims composed of sodalite and wollastonite.

Geochemistry: Olivine (Fa0.9-37.5; Cr2O3 in ferroan olivine 0.02-0.06 wt.%, mean 0.04, s.d. 0.02, N = 5), orthopyroxene (Fs1.2-9.0Wo0.8-2.9), clinopyroxene (Fs1.3Wo39.0; Fs18.1-18.4Wo46.3-47.5).

Classification: Carbonaceous chondrite (CO3.6). Subtype estimated to be 3.6 based on Cr2O3 range in ferroan olivine. Estimation of subtype based on histograms (Fig. 5) 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:Taliouine
Date:P 2011 Sep
Mass (g):225
Pieces:1
Class:CO3
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):0.9-37.5, n=7
Ferrosilite (mol%):1.2-9.0
Wollastonite (mol%):0.8-2.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):28.1
Type spec location:UWB
Main mass:J. Higgins
Comments:JH11-6; 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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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)
Aeroliths Collection Theodossiou   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7374 approved meteorites from (Northwest Africa) (plus 1957 unapproved names)

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