Meteoritical Bulletin: Entry for Northwest Africa 4923

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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: 3.9 g

Classification
history:

Recommended:

Winonaite [explanation]

This is 1 of 83 approved meteorites (plus 1 unapproved name) classified as Winonaite. [show all]
Search for other: Primitive achondrites, Winonaites

Comments:

Approved 26 Mar 2022

Writeup

help

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: Fa_4.1±0.1(Fa_4.0-4.4, FeO/MnO=23±4, n=5); low-Ca pyroxene: Fs_5.9±0.5Wo_1.6±0.1(Fs_5.4-6.5Wo_1.4-1.7, FeO/MnO=23±5, n=5); Ca-pyroxene: Fs_2.5±0.2Wo_45.3±0.4(Fs_2.2-2.9Wo_44.8-45.9, FeO/MnO=14±2, n=5); feldspar: An_7.7±4.7Ab_89.3±4.0Or_3.0±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)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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