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Northwest Africa 6931
Basic information Name: Northwest Africa 6931
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6931
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 20.62 kg
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Iron, IAB-MG 
Recommended:  Iron, IAB-MG    [explanation]

This is 1 of 112 approved meteorites classified as Iron, IAB-MG.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 3 Oct 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6931 (NWA 6931)

(Northwest Africa)

Found: 2007

Classification: Iron meteorite (IAB-MG)

History: Reportedly found near Abbadiah, Algeria

Petrography: This description is based on a small (25 g) sample of NWA 5549 and a larger piece of this new mass. Based on the compositional data and the discovery reports, the masses are paired. In hand specimen and in photos, silicates are common. A total area 25 cm2 was examined. Silicate abundance ~15 vol%, troilite ~1.5 vol%. Kamacite lengths are only ~1.5× widths, making width determination uncertain; best estimate 1.6±0.3 mm. Neumann lines are abundant. Some silicates contain abundant small metal grains. A few large (3×4 mm) kamacite lamellae with incompletely resorbed taenite were observed.

Geochemistry: Composition: 4.51 mg/g Co, 69.8 mg/g Ni, 82.4 μg/g Ga, 380 μg/g Ge, 12.0 μg/g As, 4.12 μg/g Ir, and 1.49 μg/g Au. In Wasson (2011) it was noted that NWA 5549 and this mass have compositions close to that of the abundant iron Campo del Cielo but can be resolved with precise data. Significant differences are found for Ga, W and Ir. Relative to Campo del Cielo, the mean Cr is higher in NWA 5549, but replicates scatter.

Specimens: This mass appears to be paired with NWA 5549.

Data from:
  MB100
  Table 1
  Line 1546:
Place of purchase:Erfoud, Morocco
Date:2007
Mass (g):20620
Pieces:1
Class:Iron, IAB-MG
Weathering grade:minor
Classifier:J.T. Wasson, UCLA
Type spec mass (g):270
Type spec location:UCLA
Main mass:DPitt
Comments:Submitted by J. T. Wasson
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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