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Northwest Africa 11196
Basic information Name: Northwest Africa 11196
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11196
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 908 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Iron, IAB-sLL
Recommended:  Iron, IAB-sLL    [explanation]

This is 1 of 34 approved meteorites classified as Iron, IAB-sLL.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 31 Jul 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11196 (NWA 11196)

(Northwest Africa)

Purchased: 2015

Classification: Iron meteorite (IAB-sLL)

Petrography: Sample has a high (25 vol%) FeS content. The troilite has squiggly shape with typical maximum dimensions in outcrop between 4 and 11 mm. Etching reveals well-defined kamacite, taenite and plessite but, in the section investigated, the metallic areas are too small (impinged by FeS) to define an octahedral structure. A rough estimate is that the kamacite bandwidth is in the range 0.5 to 0.8 mm.

Geochemistry: Chemical composition: Co, 4.72 mg/g; Ni, 84.6 mg/g; Cr 1380 μg/g, Ga, 57.8 μg/g; Ge, 283; As, 15.6 μg/g; W, 0.52 μg/g; Ir, 0.176 μg/g; Au, 1.538 μg/g.

Classification: The iron is compositionally a member of IAB-sLL-US. It has one near relative, GRO 06050; their elemental concentrations are mostly the same within experimental error; Ir in the NWA specimen ia about 14% higher, outside analytical error but within sampling error range for AB showers. GRO 06050 has abundant silicates and minor troilite, this new iron has abundant troilite and rare silicates. Both irons have >1000 μg/g Cr, much higher than those in other IAB-sLL-US members (Wasson and Kallemeyn, 2002; Wasson, 2011).

Bibliography:
  • Wasson J.T. and Kallemeyn, G.W. (2002) The IAB iron-meteorite complex: A group, five subgroups, numerous grouplets, closely related, mainly formed by crystal segregation in rapidly cooling melts. Geochim. Cosmochim. Acta 66 2445-2473 (link)
  • J.T. Wasson (2011) Relationship between iron-meteorite composition and size: Compositional distribution of irons from North Africa. Geochim. Cosmochim. Acta 75, 1757-1772. (link)
Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2015
Mass (g):908
Pieces:1
Class:Iron, IAB-sLL
Classifier:J.T. Wasson, UCLA
Type spec mass (g):37.6
Type spec location:UCLA
Main mass:DPitt
Comments:Submitted by 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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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