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:

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

This is 1 of 87 approved meteorites classified as Winonaite. [show all]
Search for other: Primitive achondrites, Winonaites

Comments:

Approved 26 Mar 2022

Writeup

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 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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Geography:

Coordinates:

Unknown.

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

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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