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Northwest Africa 12632
Basic information Name: Northwest Africa 12632
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12632
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 64.9 g
Meteoritical Bulletin:  MB 108  (2020)  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 21 Nov 2019
Writeup from MB 108:

Northwest Africa 12632 (NWA 12632)

(Northwest Africa)

Purchased: 2019 Feb

Classification: Martian meteorite (Shergottite)

History: Purchased in February 2019 by Darryl Pitt from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Coarse grained gabbroic specimen (mean grain size ~3 mm) composed predominantly of zoned clinopyroxene and maskelynite with accessory merrillite, chlorapatite, ulvöspinel, ilmenite, pyrrhotite and symplectitic intergrowths of fayalite+hedenbergite+silica polymorph. Very minor secondary calcite is present.

Geochemistry: Subcalcic augite (Fs29.3Wo28.2 and Fs34.0Wo25.7, FeO/MnO = 30 and 31, N = 2), ferropigeonite (Fs74.1±5.9Wo17.2±3.2, range Fs68.0-82.1Wo20.0-12.8, FeO/MnO = 40 to 42, N = 4), maskelynite (An 46.3-56.4Or2.2-0.7, N = 2).

Classification: Shergottite (gabbroic).

Specimens: 13.3 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2019 Feb
Mass (g):64.85
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):13.3
Type spec location:UWB
Main mass:D. Pitt
Comments:Work name MVCH 455; 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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