Meteoritical Bulletin: Entry for Northwest Africa 2890

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Northwest Africa 2890

Basic information

Name: Northwest Africa 2890
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2890
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass: 132 g

Classification
history:

Meteoritical Bulletin:	MB 90	(2006)	Howardite
Recommended:			Howardite [explanation]

This is 1 of 451 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Comments:

Approved 21 Sep 2005

Writeup

Writeup from MB online:

Northwest Africa 2890

Northwest Africa

Find: 2004

Achondrite (howardite)

History: An anonymous finder recovered a single stone of 132 g within the North African Sahara in 2004.

Petrography and Geochemistry: (A. Greshake, MNB) Polymict breccia with eucritic and diogenitic fragments embedded in a clastic matrix and contains dark impact melt fragments. Eucrite clasts consist mainly of frequently exsolved Ca pyroxene and plagioclase (An_96.4–97.3), pigeonite (Fs_37.3–53.0Wo_9.3–13.4), augite (Fs_23.0–31.1Wo_39.6–43.3), with minor olivine, Mg-Al-chromite, and ilmenite. Diogenitic lithologies are dominated by orthopyroxene (Fs_18.8–32.0) that are not always zoned.

Classification: Achondrite (howardite); low-shock, minimal weathering.

Specimens: A 22.1 g type specimen and one thin section are on deposit at MNB. Stefan Ralew of Germany holds the main mass.

Data from:
  MB90
  Table 2
  Line 154:

Place of purchase:	Unknown
Date:	2004
Mass (g):	132
Pieces:	1
Class:	How
Type spec mass (g):	22.1

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. 90, MAPS 41, 1383-1418 (2006)

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Gregor H.

Geography:

Coordinates:

Unknown.

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

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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