Meteoritical Bulletin: Entry for Northwest Africa 2902

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Northwest Africa 2902

Basic information

Name: Northwest Africa 2902
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2902
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass: 1000 g

Classification
history:

Meteoritical Bulletin:	MB 90	(2006)	OC-imp melt rock
Recommended:			L-melt rock [explanation]

This is 1 of 55 approved meteorites classified as L-melt rock. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 21 Sep 2005
Revised 9 Sep 2006: Update classification

Writeup

help

Writeup from MB online:

Northwest Africa 2902

Northwest Africa

Find: 2003

Ordinary chondrite (L-related, impact-melt rock)

History: An anonymous finder recovered several stones weighing 1000 g in total within the North African Sahara in 2003.

Petrography: (A. Greshake, MNB) Shows both Fe,Ni metal-poor and Fe,Ni metal-rich lithologies that both consist of small olivines, pyroxenes, and opaque phases embedded into a glassy Si,Al-rich groundmass. Ca-rich pyroxenes are rare. Olivine (Fa_12.9–23.9) and pyroxene (Fs_11.2–19.7Wo_1.1–2.7) are often compositionally zoned and sometimes pyroxene is overgrown by olivine. No chondrules are observed.

Geochemistry: Oxygen isotopes: (I. Franchi and R. C. Greenwood, OU) Metal-poor lithology: δ¹⁷O = +3.24, δ¹⁸O = +4.095, ∆¹⁷O = +1.106 (all ‰). Metal-rich lithology: δ¹⁷O = +3.452, δ¹⁸O = +4.505, ∆¹⁷O = +1.109 (all ‰).

Classification: Ordinary chondrite (L-related, impact-melt rock); shock-related crystallized impact melt, W1/2.

Specimens: A 22.7 g type specimen and one polished thin section are on deposit at MNB. Stefan Ralew of Germany holds the main mass.

Data from:
  MB90
  Table 2
  Line 158:

Place of purchase:	Unknown
Date:	2003
Mass (g):	1000
Pieces:	many
Class:	Oc-Imc
Fayalite (mol%):	12.9-23.9
Ferrosilite (mol%):	11.2-19.7
Type spec mass (g):	22.7

Plots:

O isotopes:

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
SR Meteorites

Geography:

Coordinates:

Unknown.

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

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