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Northwest Africa 10693
Basic information Name: Northwest Africa 10693
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10693
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 111 g
Meteoritical Bulletin:  MB 105  (2016)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 298 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 2 Jul 2016
Writeup from MB 105:

Northwest Africa 10693 (NWA 10693)

(Northwest Africa)

Purchased: 2016 Mar

Classification: Martian meteorite (Shergottite)

History: Purchased by Darryl Pitt in March 2016 from a dealer in Ouarzazate, Morocco.

Physical characteristics: A single rounded stone (111 g) almost completely coated by black fusion crust. The interior is light gray with randomly-distributed, larger dark grains.

Petrography: (A. Irving and S. Kuehner, UWS) Porphyritic texture. Subhedral to anhedral olivine macrocrysts are set in a relatively coarse grained groundmass composed mostly of twinned prismatic pyroxene and maskelynite with accessory Ti-rich chromite, Ti-poor chromite, ilmenite, Mg-bearing merrillite and pyrrhotite (some Ni-bearing). Olivine grains contain quenched melt inclusions surrounded by radial fractures. Pockets of brown shock melt are present.

Geochemistry: (S. Kuehner, UWS; P. Carpenter, WUSL) Olivine (Fa31.2-35.2, FeO/MnO = 47-54; rim Fa 42.5; FeO/MnO = 49; N = 5), pigeonite (Fs24.1-28.6Wo7.6-11.2; Fs23.4-23.9Wo16.5-15.8; FeO/MnO = 24-28; N = 5), subcalcic augite (Fs9.8Wo26.8; Fs9.2-15.7Wo39.1-36.2, FeO/MnO = 19-32, N = 4), maskelynite (An52.2-58.8Or1.9-0.5, N = 3).

Classification: Martian (shergottite, olivine-phyric).

Specimens: 21.4 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2016 Mar
Mass (g):111
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):31.2-32.5
Ferrosilite (mol%):25.5-28.6; 13.9-15.7
Wollastonite (mol%):7.6-10.9; 39.1-36.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.4
Type spec location:UWB
Main mass:D. Pitt
Comments:MCVICH 51; 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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
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 Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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