Meteoritical Bulletin: Entry for Northwest Africa 4900

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Northwest Africa 4900

Basic information

Name: Northwest Africa 4900
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4900
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass: 1200 g

Classification
history:

Recommended:

L3 [explanation]

This is 1 of 824 approved meteorites (plus 1 unapproved name) classified as L3. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 31 Oct 2021

Writeup

Writeup from MB 110:

Northwest Africa 4900 (NWA 4900)

(Northwest Africa)

Purchased: 2007

Classification: Ordinary chondrite (L3)

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

Physical characteristics: Brownish rock without fusion crust.

Petrography: The meteorite shows a chondritic texture with well-defined, loosely packed, and partly flattened chondrules (apparent mean diameter about 0.75 mm). Opaque phases in the fine-grained matrix are strongly altered sulfides and FeNi metal.

Classification: Ordinary chondrite (L3). L group based on chondrule size and magnetic susceptibility interpreted in the light of the weathering grade Rochette et al. (2003).

Bibliography:

Rochette P., Sagnotti L., Bourot-Denise M., Consolmagno G., Folco L., Gattacceca J., Osete M.L., and Pesonen L. (2003) Magnetic classification of stony meteorites: 1. Ordinary chondrites. Meteorit. Planet. Sci. 38 251-268. (link)

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2007
Mass (g):	1200
Pieces:	1
Class:	L3
Shock stage:	S2
Weathering grade:	W3
Fayalite (mol%):	15.0±9.4 (2.2-25.4, n=21)
Ferrosilite (mol%):	11.7±7.9 (2.6-21.8, n=12)
Wollastonite (mol%):	0.9±0.3 (0.6-1.5, n=12)
Magnetic suscept.:	4.33
Classifier:	A. Greshake, MNB
Type spec mass (g):	20
Type spec location:	MNB
Main mass:	Stefan Ralew
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

Catalogs:

References:

Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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