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Northwest Africa 11255
Basic information Name: Northwest Africa 11255
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11255
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 1099 g
Meteoritical Bulletin:  MB 106  (2018)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 324 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 9 Jun 2017
Writeup from MB 106:

Northwest Africa 11255 (NWA 11255)

(Northwest Africa)

Purchased: 2017 Mar

Classification: Martian meteorite (Shergottite)

History: Purchased by Ben Hoefnagels in March 2017 from a dealer in Zagora, Morocco.

Physical characteristics: A single stone (1099 g) partially covered with black fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) Relatively fine grained, equigranular aphyric texture. Composed predominanty of zoned clinopyroxene (~60 vol.%) and maskelynite (~40 vol.%) with accessory ilmenite, titanomagnetite, pyrrhotite and Fe-bearing merrillite, along with rare baddeleyite and potassic feldspathic glass.

Geochemistry: High-Ca pyroxene (Fs23.2-39.5Wo33.3-29.6, FeO/MnO = 31-34, N = 4), low-Ca pyroxene (Fs41.2-55.4Wo11.3-16.6, FeO/MnO = 31-33 , N = 4), maskelynite (An37.9-52.3Or4.5-2.1, N = 2).

Classification: Martian (shergottite, aphyric).

Specimens: 21.2 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 2017 Mar
Mass (g):1099
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):23.2-39.5; 41.2-55.4
Wollastonite (mol%):33.3-29.6; 11.3-16.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.2
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH055; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
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.
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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