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Northwest Africa 12949
Basic information Name: Northwest Africa 12949
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12949
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 3.14 kg
Meteoritical Bulletin:  MB 108  (2020)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 221 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 7 Nov 2019
Writeup from MB 108:

Northwest Africa 12949 (NWA 12949)

(Northwest Africa)

Purchased: 2019 May

Classification: Mesosiderite

History: Purchased in May 2019 by Craig Zlimen, Thomas Thiegs and Dr. Peter March from a dealer in Goulmima, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Aggregate (mean grainsize ~0.4 mm) of orthopyroxene, pigeonite, anorthite and ~ 40 vol.% metal (kamacite+taenite) with accessory augite, silica polymorph, Ti-chromite and troilite.

Geochemistry: Orthopyroxene (F18.0-23.5Wo1.2-3.2, FeO/MnO = 28-33, N = 3), pigeonite (Fs38.3-57.5Wo4.4-7.0, FeO/MnO = 24-30, N = 4), augite (Fs31.9-50.6Wo39.0-42.1, FeO/MnO = 33-36, N = 2), plagioclase (An90.5Or0.3), kamacite (Ni = 4.9 wt.%), taenite (Ni = 26.5 wt.%).

Classification: Mesosiderite.

Specimens: 60.2 g in the form of a polished endcut at UWB; remainder held jointly by C. Zlimen, T. Thiegs and Dr. P. March.

Data from:
  Table 0
  Line 0:
Place of purchase:Goulmima
Date:P 2019 May
Mass (g):3140
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):18.0-23.5;38.3-57.6; 31.9-50.6
Wollastonite (mol%):1.2-3.2; 4.4-7.0; 39.0-42.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):60.2
Type spec location:UWB
Main mass:C. Zlimen/T. Thiegs/P. March
Comments:Work name ZLI15; 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)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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