Meteoritical Bulletin: Entry for Northwest Africa 2904

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Northwest Africa 2904

Basic information

Name: Northwest Africa 2904
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2904
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass: 29 g

Classification
history:

Meteoritical Bulletin:	MB 90	(2006)	Eucrite
Recommended:			Eucrite-pmict [explanation]

This is 1 of 400 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 21 Sep 2005

Writeup

help

Writeup from MB online:

Northwest Africa 2904

Northwest Africa

Find: Spring 2003

Achondrite (eucrite, polymict)

History: Four stones totaling 29.04 g were recovered in the spring of 2003 from the western part of the Sahara in Morocco.

Classification and Mineralogy: (A. Greshake and M. Kurz, MNB) A polymict breccia consisting of lithic and mineral clasts set into a more fine-grained, brecciated groundmass of dominantly plagioclase and often exsolved Ca pyroxene; plagioclase frequently contains pyroxene and ilmenite inclusions. Plagioclase, An_84.6–90.7; low-Ca pyroxene, Fs_44.5–55.8Wo_1.8–2.1; Ca pyroxene, Fs_22.3–43.4Wo_15.6–42.6; minor phases include Ti-rich chromite, silica, and ilmenite. Oxygen isotopes: (I. Franchi and R. C. Greenwood, OU) δ¹⁷O = +2.16, δ¹⁸O = +4.58, ∆¹⁷O = −0.222 (all ‰) and (R. Clayton and T. Mayeda, UChi): δ¹⁷O = +2.13, δ¹⁸O = +4.74, ∆¹⁷O = −0.33 (all ‰).

Classification: Achondrite (eucrite, polymict); moderate to high shock, extensive weathering.

Specimens: A 9.95 g type specimen and one polished thin section are on deposit at MNB. Main mass with an anonymous finder.

Data from:
  MB90
  Table 2
  Line 159:

Place of purchase:	Unknown
Date:	2003
Mass (g):	29.04
Pieces:	4
Class:	Euc
Type spec mass (g):	9.95

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)
UChi: University of Chicago, Chicago, IL 60637, United States (institutional address; updated 28 Feb 2011)
Kurz: M. Kurz, Schillerstrasse 7, D-34626 Neukirchen, Germany (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 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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