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Northwest Africa 13327
Basic information Name: Northwest Africa 13327
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13327
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 346 g
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 4 Jul 2020
Writeup from MB 109:

Northwest Africa 13327 (NWA 13327)

(Northwest Africa)

Purchased: 2020 Feb

Classification: Martian meteorite (Shergottite)

History: Purchased by Eric Twelker in February 2020 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture (mean grainsize ~0.8 mm). Composed predominantly of prismatic grains of zoned clinopyroxene and lath-like maskelynite together with accessory silica polymorph, merrillite, chlorapatite, Cr-Mn-bearing ulvöspinel, ilmenite, pyrrhotite and baddeleyite. Minor secondary calcite is present.

Geochemistry: Subcalcic augite (Fs20.1-27.3Wo29.1-35.4, FeO/MnO = 19-34 , N = 5), ferroan subcalcic augite rim (Fs45.1Wo30.7, FeO/MnO = 36), ferroan pigeonite rims (Fs53.9-61.3Wo13.4-15.7, FeO/MnO = 36-37, N = 3), maskelynite (An53.4-55.7Or1.4-0.9, N = 4).

Classification: Shergottite (diabasic).

Specimens: 20.5 g plus one polished thin section at UWB; remainder with Mr. E. Twelker.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2020 Feb
Mass (g):346
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):20.1-27.3; 45.1; 53.9-61.3
Wollastonite (mol%):29.1-33.0; 30.7; 13.4-15.7
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.5
Type spec location:UWB
Main mass:E. Twelker
Comments:Work name ET20-1; 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)
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)
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. 109, in preparation (2020)
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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