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Northwest Africa 12420
Basic information Name: Northwest Africa 12420
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12420
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 3.02 kg
Classification
  history:
Recommended:  Mesosiderite    [explanation]

This is 1 of 185 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 27 Jul 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12420 (NWA 12420)

(Northwest Africa)

Purchased: 2011 Feb

Classification: Mesosiderite

History: Puchased in Temara, Morocco, by Adam Aaronson in February 2011.

Petrography: (A. Irving and S. Kuehner, UWS) Aggregate of predominantly low-Ca pyroxene (orthopyroxene cores with slightly more calcic and more ferroan rims), calcic plagioclase and metal (about 50 vol%, kamacite with taenite) plus accessory chromite, Mg-merrillite, silica polymorph and troilite.

Geochemistry: Orthopyroxene (Fs21.6-23.8Wo0.9-1.5, FeO/MnO = 31-33, N = 2), low-Ca pyroxene rim (Fs31.7Wo4.2, FeO/MnO = 26), plagioclase (An86.4-89.5Or0.7-0.5, N = 2).

Classification: Mesosiderite.

Specimens: 20.4 g including one polished endcut at UWB; remainder with Aaronson.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2011 Feb
Mass (g):3022
Pieces:1
Class:Mesosiderite
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):21.6-23.8
Wollastonite (mol%):0.9-1.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.4
Type spec location:UWB
Main mass:A. Aaronson
Comments:Work name M1213; submitted by A. Irving
Institutions
   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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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