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Northwest Africa 6992
Basic information Name: Northwest Africa 6992
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6992
Observed fall: No
Year found: 2011
Country: Algeria
Mass:help 237 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  CR2
Recommended:  CR2    [explanation]

This is 1 of 162 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 29 Nov 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6992 (NWA 6992)

Algeria

Found: 2009

Classification: Carbonaceous chondrite (CR2)

History: Purchased by Matt Morgan in 2011.

Physical characteristics: Single stone, chondrules to 3 mm visible on exterior surface, desert weathering.

Petrography: (C. Agee, UNM) Microprobe examination of a polished epoxy mount shows numerous (>50% volume) POP, PO, and BO chondrules. Many chondrules >1 mm, often with kamacite rims. Kamacite >5% volume. Fine-grained matrix. Some metal and matrix appears to be oxidized by weathering.

Geochemistry: (C. Agee and N. Wilson, UNM) Two populations of olivine (representing Type I and II chondrules) and pyroxene: Fa1.7±1.0, n=10, Fa16.9±2.0, n=4, Fs6.0±3.0Wo3.4±2.8, n=5, Fs24Wo1.0. Kamacite (wt%): Fe=94.7%, Ni=5.0%, Co=0.3%.

Classification: Carbonaceous Chondrite (CR2), moderately weathered.

Specimens: MtMorgan holds the main mass, 25 g including a probe mount on deposit at UNM.

Data from:
  MB100
  Table 1
  Line 1562:
Place of purchase:Denver
Date:2009
Mass (g):237
Pieces:1
Class:CR2
Fayalite (mol%):1.7±1.0, 16.9±2.0
Ferrosilite (mol%):6.0±3.0, 24.0
Wollastonite (mol%):3.4±2.8, 1.0
Classifier:C. Agee, UNM
Type spec mass (g):25
Type spec location:UNM
Main mass:MtMorgan
Comments:Submitted by C. Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
MtMorgan: Matt Morgan, Mile High Meteorites, P.O. Box 151293, Lakewood, CO 80215-9293, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 964 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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