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Northwest Africa 4923
Basic information Name: Northwest Africa 4923
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4923
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 3.9 g
Classification
  history:
Recommended:  Winonaite    [explanation]

This is 1 of 74 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 26 Mar 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 4923 (NWA 4923)

(Northwest Africa)

Purchased: 2007

Classification: Primitive achondrite (Winonaite)

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

Physical characteristics: Two small brownish fragments without fusion crust.

Petrography: The meteorite displays a more coarse-grained protogranular texture of typically 100 to 600 µm sized low-Ca pyroxene, forsteritic olivine, Ca-pyroxene, and less abundant sodic feldspar grains. Minor phases include chlorapatite, troilite, and kamacite. The meteorite is strongly weathered and contains abundant Fe-oxides and -hydroxides.

Geochemistry: olivine: Fa4.1±0.1 (Fa4.0-4.4, FeO/MnO=23±4, n=5); low-Ca pyroxene: Fs5.9±0.5Wo1.6±0.1 (Fs5.4-6.5Wo1.4-1.7, FeO/MnO=23±5, n=5); Ca-pyroxene: Fs2.5±0.2Wo45.3±0.4 (Fs2.2-2.9Wo44.8-45.9, FeO/MnO=14±2, n=5); feldspar: An7.7±4.7Ab89.3±4.0Or3.0±0.8, n=12

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2007
Mass (g):3.9
Pieces:2
Class:Winonaite
Shock stage:S1
Weathering grade:high
Fayalite (mol%):4.1
Ferrosilite (mol%):5.9; 2.5
Wollastonite (mol%):1.6; 45.3
Classifier:A. Greshake, MNB
Type spec mass (g):1.6
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:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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