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Northwest Africa 11057
Basic information Name: Northwest Africa 11057
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11057
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 3.66 kg
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 14 Feb 2017
Writeup from MB 106:

Northwest Africa 11057 (NWA 11057)

(Northwest Africa)

Purchased: 2016 Jun

Classification: Martian meteorite (Shergottite)

History: Purchased by Darryl Pitt in June 2016 from a dealer in Agadir, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Medium-grained igneous assemblage of predominantly zoned clinopyroxene and maskelynite with accessory ilmenite (containing rare inclusions of baddeleyite and K-bearing glass), ulvöspinel, pyrrhotite, merrillite and chlorapatite. Zoned clinopyroxene consists of pigeonite and subcalcic augite with rims of ferropigeonite. Pockets and thin veinlets of shock-produced vesicular glass (deep brown in thin section) are present.

Geochemistry: Pigeonite (Fs43.9-60.6Wo14.3-13.5, FeO/MnO = 27-35, N = 3), subcalcic augite (Fs22.4-43.8Wo35.8-30.7, FeO/MnO = 27-35, N = 5), ferropigeonite rims (Fs55.0Wo19.8; Fs72.3Wo14.5; FeO/MnO = 34-37), maskelynite (An46.0-56.3Or1.8-0.7, N = 2).

Classification: Martian meteorite (shergottite, mafic, diabasic).

Specimens: 20.4 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2016 Jun
Mass (g):3659
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):43.9-60.6; 22.4-43.8;55.0; 72.3
Wollastonite (mol%):14.3-13.5; 35.8-30.7; 19.8; 14.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.4
Type spec location:UWB
Main mass:DPitt
Comments:MVCH 84; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
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 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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