Meteoritical Bulletin: Entry for Northwest Africa 4902

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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: 36 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	EH-melt rock
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

Writeup

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; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
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Photos:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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