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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:help 1200 g
Classification
  history:
Recommended:  L3    [explanation]

This is 1 of 793 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
Writeuphelp
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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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Dirk Hohmann Photo added 20 Oct 2022
Photo added 20 Oct 2022
Photo added 20 Oct 2022
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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