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Northwest Africa 10703
Basic information Name: Northwest Africa 10703
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10703
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 111 g
Meteoritical Bulletin:  MB 105  (2016)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 288 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 2 Sep 2016
Writeup from MB 105:

Northwest Africa 10703 (NWA 10703)

(Northwest Africa)

Purchased: 2015 Sep

Classification: Martian meteorite (Shergottite)

History: Purchased by Eric Twelker in September 2015 from a dealer at the Denver Show.

Physical characteristics: The stone (111 g) exhibits a semi-glossy, green and black, wind-ablated exterior. The interior is notable for the presence of relatively abundant pockets of dark, vesicular glass.

Petrography: (A. Irving and S. Kuehner, UWS) Diabasic texture. Composed mainly of zoned clinopyroxene and maskelynite with accessory ilmenite, ulvöspinel, pyrrhotite, chlorapatite, Fe-bearing merrillite and silica polymorph (associated with maskelynite), plus pockets of shock glass (light brown in thin section with a swirled appearance).

Geochemistry: Pigeonite (Fs43.9-44.2Wo15.3-14.3; Fs65.8Wo13.8; FeO/MnO = 30-35; N = 3), subcalcic augite (Fs20.7-21.1Wo35.3-33.9, FeO/MnO = 24-25; Fs55.5Wo23.3, FeO/MnO = 34 ; N = 3), maskelynite (An44.5-54.4Or5.4-1.3, N = 3).

Classification: Martian (shergottite, diabasic). Paired with NWA 8656 and NWA 8657.

Specimens: 22.2 g including one polished thin section at UWB; remainder with Twelker.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2015 Sep
Mass (g):111
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):43.9-44.2; 65.8; 20.7-21.1; 55.5
Wollastonite (mol%):15.3-14.3; 13.8; 35.3-33.9; 23.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22.2
Type spec location:UWB
Main mass:E. Twelker
Comments:ET16-1; 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)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
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 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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