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Northwest Africa 11955
Basic information Name: Northwest Africa 11955
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11955
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 272 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 15 Sep 2018
Writeup from MB 107:

Northwest Africa 11955 (NWA 11955)

(Northwest Africa)

Purchased: 2018 May

Classification: Martian meteorite (Shergottite)

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

Petrography: (A. Irving and S. Kuehner, UWS) Inequigranular gabbroic texture (pyroxene up to 3.1 mm, olivine up to 2.3 mm in length). Composed of homogeneous olivine, zoned pigeonite (prismatically twinned) and maskelynite with accessory Ti-chromite, ilmenite, merrillite, chlorapatite, pyrrhotite and minor baddeleyite.

Geochemistry: Olivine (Fa49.3-49.4, FeO/MnO = 51-56, N = 3), pigeonite (Fs29.2-45.7Wo10.4-8.1, FeO/MnO = 30-33, N = 4), maskleynite (An50.9-55.0Or2.0-1.9, N = 2).

Classification: Shergottite (gabbroic).

Specimens: 23.4 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2018 May
Mass (g):272
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):49.3-49.4
Ferrosilite (mol%):29.2-45.7
Wollastonite (mol%):10.4-8.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):23.4
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH141; 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 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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