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Northwest Africa 11530
Basic information Name: Northwest Africa 11530
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11530
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 76.2 g
Meteoritical Bulletin:  MB 106  (2018)  Iron, ungrouped
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 143 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped.   [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons
Comments: Approved 18 Dec 2017
Writeup from MB 106:

Northwest Africa 11530 (NWA 11530)

(Northwest Africa)

Purchased: June 2016

Classification: Iron meteorite (ungrouped)

History: Purchased by the owner at Sainte Marie-aux-Mines in June 2016.

Physical characteristics: The main mass has an irregular shape with one flat, pitted side; the other side is more rounded. The surface is dark brown and the rounded side shows a bright patina.

Petrography: Polished and etched surfaces show no Widmanstatten pattern, with troilite nodules up to 2 mm. SEM examination reveals kamacite laths ~30 × 200 μm containing ~20 μm schreibersite inclusions. Taenite is present interstitial to kamacite laths.

Geochemistry: ICP-MS data, using sample of North Chile (Filomena) as standard (C. Herd and G. Chen UAb): Ni = 15.8, Co = 0.46 (both wt%); Ir = 23.6, Ga = 52, As = 16, W = 1.1, Re = 1.5, Os = 18.9, Cu = 535, Pd = 4.0, Pt = 13.3, Au = 2.0 (all μg/g).

Classification: (C. Herd, UAb): Iron, ungrouped. Ga, Pt, Cu, and Au concentrations too high for the high-Ni groups. Texture suggests recrystallization as a result of shock heating.

Specimens: Type specimen consisting of a 16.6 g representative slice at UAb. Main mass with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Sainte Marie-aux-Mines
Date:P June 2016
Mass (g):76.2
Class:Iron, ungrouped
Shock stage:high
Weathering grade:low
Classifier:C. Herd, UAb
Type spec mass (g):16.6
Type spec location:UAb
Main mass:F. Kuntz
Comments:Field name K303; submitted by C. Herd
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
Kuntz: Fabien Kuntz, France; Website (private address)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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