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Northwest Africa 11866
Basic information Name: Northwest Africa 11866
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11866
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 23.3 g
Meteoritical Bulletin:  MB 107  (2018)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 284 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 17 Jul 2018
Writeup from MB 107:

Northwest Africa 11866 (NWA 11866)

(Northwest Africa)

Purchased: 2018 May

Classification: Martian meteorite (Shergottite)

History: Purchased by Ben Hoefnagels in May 2018 from a dealer in Zagora, Morocco.

Physical characteristics: A group of broken fragments with exterior coatings of black fusion crust (23.3 g) from an unknown larger stone. The pieces are very fresh and contain gray pyroxene and obvious glassy maskelynite.

Petrography: (A. Irving and S. Kuehner, UWS) Diabasic texture. Igneous assemblage of predominantly zoned clinopyroxene and maskelynite with accessory titanomagnetite, ilmenite, pyrrhotite and rare Fe-merrillite. Low-Ca pyroxene compositions do not extend to very magnesian compositions.

Geochemistry: Pigeonite (Fs41.8-58.8Wo11.1-14.4, FeO/MnO = 33-36, N = 4), subcalcic augite (Fs24.5-47.2Wo33.9-28.8, FeO/MnO = 30-38, N = 3), maskelynite (An53.8-54.4Or0.9, N = 2).

Classification: Martian (shergottite, diabasic). Although the pyroxene compositions are somewhat like those in Shergotty, the trend for low-Ca pyroxenes does not extend to as magnesian values.

Specimens: 4.8 g in the form of a polished endcut at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2018 May
Mass (g):23.3
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):41.8-58.8; 24.5-47.2
Wollastonite (mol%):11.1-14.4; 33.9-28.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):4.8
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH144; 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 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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