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Northwest Africa 12536
Basic information Name: Northwest Africa 12536
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12536
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 64.4 g
Meteoritical Bulletin:  MB 108  (2020)  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 5 Apr 2019
Writeup from MB 108:

Northwest Africa 12536 (NWA 12536)

(Northwest Africa)

Purchased: 2019 Jan

Classification: Martian meteorite (Shergottite)

History: Purchased by Ben Hoefnagels in January 2019 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Porphyritic texture. Phenocrysts of zoned olivine (up to 2 mm, containing tiny inclusions of chromite) are set in a relatively coarse grained groundmass composed mainly of twinned pigeonite and maskelynite together with minor orthopyroxene, Mg-bearing merrillite, ilmenite, chromite and pyrrhotite. Small pockets and cross-cutting veinlets of dark brown, glassy shock melt are present.

Geochemistry: Olivine (cores Fa22.9-23.3, rim Fa50.2, FeO/MnO = 49-53, N = 3), orthopyroxene (Fs19.0Wo2.4, FeO/MnO = 29), pigeonite (Fs25.5-36.1Wo6.8-10.2, FeO/MnO = 26-33, N = 4), maskleynite (An57.2-66.7Or0.7-0.4, N = 2).

Classification: Shergottite (olivine-phyric).

Specimens: 12.9 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Jan
Mass (g):64.4
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):22.9-50.2
Ferrosilite (mol%):19.0; 25.5-36.1
Wollastonite (mol%):2.4; 6.8-10.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):12.9
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH201; 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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