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Northwest Africa 12210
Basic information Name: Northwest Africa 12210
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12210
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 151 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 12 Nov 2018
Writeup from MB 107:

Northwest Africa 12210 (NWA 12210)

(Northwest Africa)

Purchased: 2018 Jun

Classification: Martian meteorite (Shergottite)

History: Purchased by Ben Hoefnagels in June 2018 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Poikilitic texture. Large pyroxene oikocrysts (up to 6 mm across) enclose olivine chadacrysts, and are set in a relatively coarse grained groundmass containing olivine, pyroxenes, lath-like maskelynite, abundant phosphates (both merrillite and chlorapatite), Ti-poor chromite and pyrrhotite. Mafic silicates exhibit very limited compositional zoning. Cores of pyroxene oikocrysts are stained orange.

Geochemistry: Olivine (Fa38.1-40.7, FeO/MnO = 49-51, N = 3), low-Ca pyroxene core (Fs24.7Wo4.1, FeO/MnO = 30), pigeonite (Fs26.4-30.8Wo11.0-7.5; Fs28.1Wo16.3; FeO/MnO = 25-29; N = 3), subcalcic augite (Fs16.8-18.5Wo33.7-36.6, FeO/MnO = 23-25, N = 2), maskleynite (An53.8-54.4Or2.1-2.2, N = 2).

Classification: Martian (shergottite, poikilitic).

Specimens: 20.5 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2018 Jun
Mass (g):151
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):38.1-40.7
Ferrosilite (mol%):24.7; 26.4-30.8; 16.8-18.5
Wollastonite (mol%):4.1; 11.0-7.5; 33.7-36.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.5
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH142; 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 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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