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Northwest Africa 11261
Basic information Name: Northwest Africa 11261
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11261
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 114.2 g
Meteoritical Bulletin:  MB 106  (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 9 Jun 2017
Writeup from MB 106:

Northwest Africa 11261 (NWA 11261)

(Northwest Africa)

Purchased: 2017 Mar

Classification: Martian meteorite (Shergottite)

History: Purchased by Ben Hoefnagels in March 2017 from a Moroccan dealer.

Physical characteristics: A single rounded ellipsoidal stone (114.2 g) coated with red-brown weathering products, but with a fresher, green interior.

Petrography: (A. Irving and S. Kuehner, UWS) Olivine-rich with predominantly an olivine-orthocumulate texture, although there are also sparse pigeonite oikocrysts (up to 3 mm) containing olivine chadacrysts. Other minerals are intercumulus pigeonite (~15 vol.%) and maskelynite (~6 vol.%), plus accessory chromite (with a range of Ti contents), ilmenite, pentlandite, pyrrhotite, Mg-bearing merrillite, rare baddeleyite and minor barite. The mafic silicate phases have very limited compositional variation. Polycrystalline melt inclusions surrounded by radial expansion cracks are present in olivine. Secondary calcite is present in the form of very thin cross-cutting veinlets and grain boundary coatings on maskelynite grains.

Geochemistry: Olivine (Fa36.0-37.3, FeO/MnO = 48-50, N = 3), pigeonite (Fs29.3-30.3Wo8.6-6.8, FeO/MnO = 27-32, N = 3), maskelynite (An51.2-51.8Or1.4-1.7, N = 2).

Classification: Martian (shergottite, olivine-orthocumulate).

Specimens: 25 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017 Mar
Mass (g):114.2
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):36.0-37.3
Ferrosilite (mol%):29.3-30.3
Wollastonite (mol%):8.6-6.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):25
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH066; 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 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 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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