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Northwest Africa 12564
Basic information Name: Northwest Africa 12564
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12564
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1918 g
Meteoritical Bulletin:  MB 108  (2020)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 307 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 3 May 2019
Writeup from MB 108:

Northwest Africa 12564 (NWA 12564)

(Northwest Africa)

Purchased: 2019 Feb

Classification: Martian meteorite (Shergottite)

History: Purportedly found in Mauritania and purchased in February 2019 by Jaouad Chaoui and Rachid Chaoui from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Diabasic texture (mean grainsize ~1 mm). Composed predominantly of complexly-zoned clinopyroxene and maskelynite with accessory titanomagnetite, ilmenite, chlorapatite, merrillite, and pyrrhotite. Myrmekitic intergrowths consisting of silica polymorph + relatively sodic plagioclase are associated with more calcic maskelynite and regions of K-rich glass containing blebs of pyrrhotite are also present.

Geochemistry: Subcalcic augite (Fs22.5-48.6Wo32.2-25.4, FeO/MnO = 30-36, N = 3), ferropigeonite (Fs65.5Wo15.9, FeO/MnO = 39), large maskelynite grains (An48.6-53.0Or2.3-2.0, N = 2), plagioclase in intergrowth with silica polymorph (An34.0Ab62.4Or3.6).

Classification: Shergottite (aphyric, diabasic).

Specimens: 26.5 g including one polished thin section at UWB; remainder held jointly by J. Chaoui and R. Chaoui.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2019 Feb
Mass (g):1918
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):22.5-48.6
Wollastonite (mol%):32.2-25.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):26.5
Type spec location:UWB
Main mass:J. Chaoui/R. Chaoui
Comments:Work name RC110.1; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Photos from the Encyclopedia of Meteorites:
Sergey Vasiliev   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Antonello Petriccione   
chen wang   

     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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