Meteoritical Bulletin: Entry for Northwest Africa 4922

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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: 4 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 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: Fa_4.2±0.1(Fa_4.2-4.3, FeO/MnO=24±2, n=5); low-Ca pyroxene: Fs_6.3±0.1Wo_1.6±0.1(Fs_6.1-6.5Wo_1.5-1.7, FeO/MnO=26±4, n=5); Ca-pyroxene: Fs_2.4±0.1Wo_44.8±0.3(Fs_2.2-2.5Wo_44.2-45.1, FeO/MnO=18±7, n=5); feldspar: An_8.1±1.0Ab_89.8±0.9Or_2.0±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 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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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