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Northwest Africa 7182
Basic information Name: Northwest Africa 7182
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7182
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 17 g
Meteoritical Bulletin:  MB 101  (2012)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 298 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 30 Oct 2012
Writeup from MB 101:

Northwest Africa 7182 (NWA 7182)

(Northwest Africa)

Found: 2010

Classification: Martian meteorite (Shergottite)

History: Found by a prospector in the western part of the Sahara in 2010 and purchased from an Austrian dealer by Sam Gafford in May 2011.

Physical characteristics: A single partially fusion crusted stone (17 g). The interior is brownish-gray with some thin cross-cutting black glassy veinlets.

Petrography: (A. Irving and S. Kuehner, UWS) Intersertal texture with subequal proportions of zoned clinopyroxene and maskelynite, plus accessory oxides (intergrown ulvospinel and ilmenite), phosphates and pyrrhotite. Melt inclusions within ulvospinel consist of K-Si-rich glass, with marginal daughter crystals (mostly ferroan pigeonite).

Geochemistry: Pigeonite (Fs49.6-61.2Wo13.1-14.1, FeO/MnO = 36-38), augite (Fs25.0-25.1Wo33.0-33.2, FeO/MnO = 29-30), plagioclase (An53.4-54.7Or0.9-1.2).

Classification: Martian (shergottite). This stone is likely paired with NWA 2975 and numerous other such stones, based on similarities in texture and mineralogy (especially the distinctive melt inclusions in ulvospinel).

Specimens: 3.4 g of material and one polished thin section are on deposit at UWB. Mr. S. Gafford of Lee, Illinois, holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Austria
Mass (g):17
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):49.6-61.2; 25.0-25.1
Wollastonite (mol%):13.1-14.1; 33.0-33.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):3.4
Type spec location:UWB
Main mass:S. Gafford
Comments:Submitted by A. Irving
   and collections
SAM: Department of Mineralogy, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia; Website (institutional address; updated 18 Oct 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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