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Northwest Africa 8539
Basic information Name: Northwest Africa 8539
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8539
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 2.6 kg
Meteoritical Bulletin:  MB 105  (2016)  Iron, IAB-ung
Recommended:  Iron, IAB-ung    [explanation]

This is 1 of 68 approved meteorites classified as Iron, IAB-ung.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 31 Mar 2016
Writeup from MB 105:

Northwest Africa 8539 (NWA 8539)

(Northwest Africa)

Purchased: 2012

Classification: Iron meteorite (IAB, ungrouped)

Petrography: As previously described for NWA 8154 and NWA 8155, the metal consists of tiny grains 0.15 mm, with no evidence of an octahedral pattern. The structures are anomalous. The absence of a pattern suggest fast cooling. The small graphite ellipsoids (sometimes arranged like the petals of a flower) may reflect the locations of the last, C-rich melt to crystallize.

Geochemistry: UCLA INAA data: Co, 4.70 mg/g; Ni, 134.5 mg/g; Ga, 51.0 μg/g; Ge,~294 μg/g.; Sb 650 ng/g; As, 16.5 μg/g; Ir 27.0 μg/g; Au, 1.602 μg/g.

Classification: Based on their high contents of Au, As and Sb this meteorite (NWA 8539) and its three siblings (NWA 8154, 8155 and 7795) are classified ungrouped members of the IAB complex. However, non-IAB ungrouped irons have lower contents of these elements (and especially of Sb). It is ungrouped because it does not consistently plot in the Ni-Au, As-Au, Co-Au and Ga-Au fields of the IAB main group or of the five IAB subgroups.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2012
Mass (g):2595
Class:Iron, IAB-ung
Classifier:J. T. Wasson, UCLA
Type spec mass (g):130 g
Type spec location:PMO
Main mass:Ke Zuokai
Comments:Submitted by W. Hsu
   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)
PMO: Purple Mountain Observatory, Nanjing, China (institutional address; updated 16 Dec 2011)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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