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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:
Meteoritical Bulletin:  MB 111  (2023)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 273 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
McKinley Collection   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)
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Revision
  history:
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