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Northwest Africa 11804
Basic information Name: Northwest Africa 11804
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11804
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 34 g
Meteoritical Bulletin:  MB 107  (2018)  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 28 May 2018
Writeup from MB 107:

Northwest Africa 11804 (NWA 11804)

(Northwest Africa)

Purchased: 2018 Jan

Classification: Martian meteorite (Shergottite)

History: Purportedly found in the Tanezrouft region of Algeria and purchased by John Higgins in January 2018 from a Mauritanian dealer.

Physical characteristics: A single disaggregated brownish stone (34 grams). Several of the desert-ablated fragments fit together and some retain partial black fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) Diabasic assemblage of mainly zoned clinopyroxene and maskelynite with accessory ilmenite, titanomagnetite, fayalite and pyrrhotite. Inclusions of K-rich glass and silica polymorph are present within pyroxenes.

Geochemistry: Subcalcic augite (Fs26.1-45.0Wo28.6-30.8, FeO/MnO = 31-38, N = 3), pigeonite (Fs47.8-59.8Wo12.7-15.4, FeO/MnO = 35-37, N = 3), fayalite (Fa76.3, FeO/MnO =54), maskelynite (An53.1-53.3Or0.9-1.0, N = 2).

Classification: Shergottite (diabasic). Paired with NWA 2975 and many other stones found in the Tanezrouft area.

Specimens: 6.88 g including one polished thick section at UWB; remainder with Mr. J. Higgins.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018 Jan
Mass (g):34
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):76.3
Ferrosilite (mol%):26.1-45.0; 47.8-59.8
Wollastonite (mol%):28.6-30.8; 12.7-15.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):6.88
Type spec location:UWB
Main mass:J. Higgins
Comments:JH18-2; submitted by A. Irving
   and collections
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. 107, MAPS 55, 460-462
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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