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Northwest Africa 4902
Basic information Name: Northwest Africa 4902
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4902
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 36 g
Classification
  history:
Recommended:  EH-melt rock    [explanation]

This is 1 of 7 approved meteorites classified as EH-melt rock.   [show all]
Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), Enstatite-rich meteorites, and Melted chondrites
Comments: Approved 22 Apr 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 4902 (NWA 4902)

(Northwest Africa)

Purchased: 2007

Classification: Enstatite chondrite (EH melt rock)

History: The meteorite was purchased in 2007 from a local meteorite dealer in Rissani, Morocco.

Physical characteristics: Brownish individual without fusion crust.

Petrography: The meteorite is an enstatite melt-rock composed of individual, up to 1 mm sized, rounded to sub-rounded, enstatite grains supported by abundant interstitial melt. The melt is largely recrystallized to albitic feldpar and minor residual groundmass and often contains Mg-sulfide spherules. Minor phases include daubreelite, niningerite, oldhamite, schreibersite, and troilite. Kamacite is Si-rich.

Geochemistry: Si in FeNi-metal is about 4.3 wt.% (N=8)

Classification: EH due to the presence of niningerite and the high silica content of FeNi metal.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Rissani, Morocco
Date:P 2007
Mass (g):36
Pieces:1
Class:EH-melt rock
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):0.2±0.1, n=12
Wollastonite (mol%):0.4±0.1, n=12
Classifier:A. Greshake, MNB
Type spec mass (g):7.5
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)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6730 approved meteorites from (Northwest Africa) (plus 2025 unapproved names)

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