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Northwest Africa 4922
Basic information Name: Northwest Africa 4922
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4922
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 4 g
Classification
  history:
Recommended:  Winonaite    [explanation]

This is 1 of 76 approved meteorites (plus 2 unapproved names) classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 26 Mar 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 4922 (NWA 4922)

(Northwest Africa)

Purchased: 2007

Classification: Primitive achondrite (Winonaite)

History: The meteorite was purchased from a local meteorite dealer in Erfoud, Morocco.

Physical characteristics: Brownish fragment without fusion crust.

Petrography: The meteorite shows a granoblastic texture with abundant triple junctions composed of 50-300 µm sized forsteritic olivine, enstatite, augite, and sodic plagioclase grains. Accessories are troilite and kamacite. Grain boundaries are frequently decorated with iron oxides and -hydroxides.

Geochemistry: olivine: Fa4.2±0.1 (Fa4.2-4.3, FeO/MnO=24±2, n=5); low-Ca pyroxene: Fs6.3±0.1Wo1.6±0.1 (Fs6.1-6.5Wo1.5-1.7, FeO/MnO=26±4, n=5); Ca-pyroxene: Fs2.4±0.1Wo44.8±0.3 (Fs2.2-2.5Wo44.2-45.1, FeO/MnO=18±7, n=5); feldspar: An8.1±1.0Ab89.8±0.9Or2.0±0.3, n=10

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2007
Mass (g):4
Pieces:1
Class:Winonaite
Shock stage:S1
Weathering grade:high
Fayalite (mol%):4.2
Ferrosilite (mol%):6.3; 2.4
Wollastonite (mol%):1.6; 44.8
Classifier:A. Greshake, MNB
Type spec mass (g):1
Type spec location:MNB
Main mass:Hanno Strufe
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
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 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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