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Northwest Africa 10761
Basic information Name: Northwest Africa 10761
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10761
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 473 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 200 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 2 Sep 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10761 (NWA 10761)

(Northwest Africa)

Purchased: 2016 Apr

Classification: Martian meteorite (Shergottite)

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

Physical characteristics: Dark, ellipsoidal, coarse grained specimen (473 g) characterized by prominent elongate prismatic, pale yellow-green grains and patches of black vesicular glass.

Petrography: (A. Irving and S. Kuehner, UWS) Composed of very large, zoned and twinned clinopyroxene (as prismatic grains up to 2.3 cm in length) with interstitial regions of interleaved, finer grained pyroxene and maskelynite plus Fe-Ti oxides (some with finely exsolved ilmenite + ulvöspinel), pyrrhotite, Fe-bearing merrillite, fayalite, silica polymorph, baddeleyite and intergrowths of fayalite+hedenbergite+silica (after pyroxferroite). Shock pockets composed mainly of vesicular glass (sepia brown in thin section) are present.

Geochemistry: Low-Ca pyroxene (Fs20.2-23.6Wo2.7-3.9, FeO/MnO = 29-31, N = 4), high-Ca pyroxene (Fs22.8-32.6Wo30.9-26.2, FeO/MnO = 26-29, N = 4), pigeonite (Fs46.3Wo13.0, FeO/MnO = 34), ferropigeonite (Fs62.1-73.3Wo19.8-19.1; Fs85.7Wo13.1; FeO/MnO = 38-42; N = 3), ferroan subcalcic augite (Fs59.9Wo34.8, FeO/MnO = 38), fayalite (Fa97.5-99.4, FeO/MnO = 44-56, N = 2), maskelynite (An52.2-52.3Or1.0-0.7, N = 2).

Classification: Martian (shergottite, gabbroic).

Specimens: 21.5 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2016 Apr
Mass (g):473
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):97.5-99.4
Ferrosilite (mol%):20.2-23.6; 22.5-32.6
Wollastonite (mol%):2.7-3.9; 30.9-26.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.5
Type spec location:UWB
Main mass:DPitt
Comments:MCVICH 52; submitted by A. Irving
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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