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Northwest Africa 14922
Basic information Name: Northwest Africa 14922
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14922
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 190 g
Classification
  history:
Recommended:  Mesosiderite    [explanation]

This is 1 of 230 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 20 Jun 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14922 (NWA 14922)

(Northwest Africa)

Purchased: 2021 Jun

Classification: Mesosiderite

History: Purchased by Matthew Stream in June 2021 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Aggregate of zoned orthopyroxene (some grains up to 5 mm), calcic plagioclase and extensively altered kamacite (~40 vol.%) together with accessory olivine (with chromite grains in rims), augite, silica polymorph, Ti-chromite, troilite, ilmenite, pentlandite and merrillite. A 6 mm fine-grained ophitic eucrite clast is present in the studied thin section.

Geochemistry: Low-Ca pyroxene (cores Fs31.2-32.3Wo2.1-3.9, FeO/MnO = 24-32, N = 2; rims Fs35.6-38.5Wo3.8-4.0, FeO/MnO = 20-25, N = 3), olivine (Fa18.3-22.8, FeO/MnO = 42-43, N = 2), low-Ca pyroxene rim on olivine (Fs16.3Wo2.6, FeO/MnO = 24), augite (Fs20.1Wo39.5, FeO/MnO = 17), plagioclase (An89.3-92.9Or0.2-0.0, N = 2).

Classification: Mesosiderite.

Specimens: 20.48 g including one polished thin section at UWB; remainder with Mr. M. Stream.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021 Jun
Mass (g):190
Pieces:3
Class:Mesosiderite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):18.3-22.8
Ferrosilite (mol%):31.2-38.5; 20.1
Wollastonite (mol%):2.1-4.0; 39.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.48
Type spec location:UWB
Main mass:M. Stream
Comments:Work name MS21-4; 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)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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