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Northwest Africa 12323
Basic information Name: Northwest Africa 12323
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12323
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 447 g
Meteoritical Bulletin:  MB 107  (2018)  Martian (shergottite)
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 14 Dec 2018
Writeup from MB 107:

Northwest Africa 12323 (NWA 12323)

(Northwest Africa)

Purchased: 2018 Aug

Classification: Martian meteorite (Shergottite)

History: Purchased by Ben Hoefnagels in August 2018 from a dealer in Agadir, Morocco.

Physical characteristics: Single stone (447 g) exhibiting a brown weathered exterior and a fresh interior with obvious glassy maskelynite. The specimen is crosscut by several thin, dark shock melt veinlets.

Petrography: (A. Irving and S. Kuehner, UWS) Gabbroic assemblage of predominantly prismatic, zoned and twinned grains of clinopyroxene (up to 3.6 mm long) and maskelynite (some as thin, curved laths in sheaf-like groups) with accessory merrillite, ilmenite, ulvöspinel and pyrrhotite, plus minor secondary barite and calcite.

Geochemistry: Orthopyroxene core (Fs22.1Wo3.1, FeO/MnO = 32), pigeonite (Fs29.9Wo7.3; Fs31.9-76.8Wo13.7-15.7; FeO/MnO = 31-46; N = 5), subcalcic augite (Fs28.9-39.3Wo31.7-27.1, FeO/MnO = 33-37, N = 2), maskelynite (An54.6-54.7Or0.6-0.5, N = 2).

Classification: Martian (shergottite, gabbroic).

Specimens: 22.1 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2018 Aug
Mass (g):447
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):22.1; 29.9; 31.9-76.8; 28.9-39.3
Wollastonite (mol%):3.1; 7.3; 13.7-15.7; 31.7-27.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22.1
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH145; 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)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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