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Northwest Africa 6445
Basic information Name: Northwest Africa 6445
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6445
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 571 g
Classification
  history:
Recommended:  CO3    [explanation]

This is 1 of 623 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 12 Dec 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 6445 (NWA 6445)

(Northwest Africa)

Purchased: 2010

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Fabien Kuntz in 2010 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL; T. Bunch and J. Wittke, NAU) Granular chondrules (apparent diameter 390±280 µm, N = 23), sparse, rimmed, amoeboid inclusions and angular mineral fragments are set in a finer grained matrix (~ 20 vol.%, orange in thin section). The amoeboid inclusions are composed of very fine grained hercynite, Al-Ti-diopside, calcite and ilmenite, and are rimmed by a chlorite-like phase.

Geochemistry: Olivine (Fa15.4±20.3, range Fa0.2-40.3, N = 5; Cr2O3 in ferroan examples 0.02-0.06 wt.%, mean 0.04±0.02 wt.%, N = 7), low-Ca pyroxene (Fs6.8±5.1Wo2.8±1.9, range Fs1.2-14.6Wo0.9-5.5, N = 7), clinopyroxene (Fs3.5±2.2Wo44.9±3.6, range Fs1.0-5.4Wo41.3-48.4, N = 3), plagioclase (An74.7Or0.8).

Classification: Carbonaceous chondrite (CO3). The mean size of chondrules in this specimen is somewhat larger than in most CO chondrites. Typical CAI appear to be absent; the phyllosilicate-rimmed amoeboid inclusions are very unusual and are mineralogically unlike typical CAI.

Specimens: 21.0 g plus one polished thin section at PSF; main mass with Kuntz.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2010
Mass (g):571
Pieces:1
Class:CO3
Shock stage:S2
Weathering grade:low
Fayalite (mol%):15.4±20.3
Ferrosilite (mol%):6.8±5.1
Wollastonite (mol%):2.8±1.9
Classifier:A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL; T. Bunch and J. Wittke, NAU
Type spec mass (g):21.0
Type spec location:PSF
Main mass:Kuntz
Comments:K151; submitted by A. Irving
Institutions
   and collections		 NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Michael S. Scherman   
Nuno Chaves   
Solar Anamnesis               
The Wilcox Collection of Meteorites   
xeqtr   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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