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Northwest Africa 7670
Basic information Name: Northwest Africa 7670
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7670
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 18.9 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  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 1 Jul 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 7670 (NWA 7670)

(Northwest Africa)

Purchased: 2012 Dec

Classification: Carbonaceous chondrite (CM2)

History: Purchased in Temara, Morocco by Adam Aaronson in August 2012.

Physical characteristics: Exceptionally fresh, black specimen (18.9 g) with thin vesicular fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) Composed of separated, small chondrules (0.2 to 0.5 mm), zoned angular olivine grains and sporadic fine-grained CAIs in a black, fine-grained matrix containing cronstedtite, pentlandite, chromite, and schreibersite. Merrillite was found in one chondrule. Minerals identified in small CAI include hibonite with perovskite (mantled by andradite and diopside), spinel with forsterite, and rare tiny grains of ruthenium (possibly refractory metal grains from CAI) were identified by EDX.

Geochemistry: Olivine (Fa0.9-52.8), orthopyroxene (Fs1.0Wo3.1), subcalcic augite (Fs1.7Wo37.6).

Classification: Carbonaceous chondrite (CM2).

Specimens: A total of 20.2 g of material and one polished thin section are on deposit at UWB. Aaronson holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2012 Dec
Mass (g):18.9
Pieces:1
Class:CM2
Shock stage:S1
Weathering grade:W0
Fayalite (mol%):0.9-52.8
Ferrosilite (mol%):1.0
Wollastonite (mol%):3.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):3.8
Type spec location:UWB
Main mass:A. Aaronson
Comments:M1463; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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