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Northwest Africa 10808
Basic information Name: Northwest Africa 10808
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10808
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 188 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 293 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 24 Sep 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10808 (NWA 10808)

(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: Tan colored stone (188 g) with partial black fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) Poikilitic texture. Composed mainly of zoned clinopyroxene (pigeonite, augite and subcalcic augite), olivine and interstitial, lath-like maskelynite with accessory ilmenite, Mg-bearing merrillite and pyrrhotite (some Ni-bearing) and baddeleyite. Some olivine occurs as anhedral chadacrysts within larger pyroxene grains. Olivine grains contain quenched melt inclusions (composed of glass with aluminous clinopyroxene crystallites). Some small shock melt pockets composed of dark glass are present.

Geochemistry: Olivine (Fa30.3-32.2, FeO/MnO = 42-44, N = 3), pigeonite (Fs24.7-26.6Wo9.3-8.4, FeO/MnO = 25-26, N = 4), augite and subcalcic augite (Fs13.7-16.2Wo40.0-31.4, FeO/MnO = 21-24, N = 4), maskelynite (An50.6-50.7Or1.5-1.8, N = 2). Oxygen isotopes (K. Ziegler, UNM): analysis of acid-washed subsamples by laser fluorination gave, respectively, d17O = 2.810, 2.812, 2.751, 2.683; d18O = 4.780, 4.779, 4.602, 4.660; D17O = 0.286, 0.289, 0.321, 0.223 per mil.

Classification: Martian (shergottite, poikilitic).

Specimens: 20.67 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):188
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):30.3-32.2
Ferrosilite (mol%):24.7-26.6; 13.7-16.2
Wollastonite (mol%):9.3-8.4; 40.0-31.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.67
Type spec location:UWB
Main mass:D. Pitt
Comments:MCVICH 54; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections		 UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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