Meteoritical Bulletin: Entry for Northwest Africa 2899

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Northwest Africa 2899

Basic information

Name: Northwest Africa 2899
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2899
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass: 11 g

Classification
history:

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

This is 1 of 13 approved meteorites classified as H-melt rock. [show all]
Search for other: H chondrites, H 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 2899

Northwest Africa

Find: 2004

Ordinary chondrite (H-related impact-melt rock)

History: A single stone of 11 g was found 2004 by an anonymous finder in the North African Saharan desert. Petrography: (A. Greshake, MNB) The stone is composed of small, mostly euhedral olivines (Fa_6.1–23.9) embedded into a glassy groundmass. Most olivines show a pronounced compositional zoning with Mg-rich cores and Fe-rich rims or vice versa. Small spherical Fe,Ni sulfides are often found in the groundmass and Fe,Ni metal is present. Chondrules were not observed.

Geochemistry: Oxygen isotopes: (I. Franchi and R. C. Greenwood, OU) δ¹⁷O = +3.088, δ¹⁸O = +4.898, ∆¹⁷O = +0.541 (all ‰).

Classification: Ordinary chondrite (H-related impact-melt rock) with shock-related crystallized impact melt, W0/1.

Specimens: A 2.5 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 155:

Place of purchase:	Unknown
Date:	2004
Mass (g):	11
Pieces:	1
Class:	Oc
Type spec mass (g):	2.5

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)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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