Meteoritical Bulletin: Entry for Northwest Africa 4023

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Northwest Africa 4023

Basic information

Name: Northwest Africa 4023
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4023
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 17.2 g

Classification
history:

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

This is 1 of 355 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 3 Feb 2006
Revised 9 Sep 2006: Update classification

Writeup

help

Writeup from MB 90:

Northwest Africa 4023

Northwest Africa

Find: 2005

Achondrite (eucrite, polymict)

History: A single stone of 17.2 g partly covered with fusion crust was found in the western part of the Sahara in Morocco in 2005.

Petrography: (A. Greshake, MNB) A polymict breccia consisting of basaltic, melt clasts, and mineral clasts set into a fine-grained brecciated groundmass. Mineral fragments are dominantly plagioclase and exsolved Ca pyroxene. Minor phases include silica, Al-Ti-chromite, and ilmenite.

Geochemistry: Plagioclase (An_78.6–94.2), pyroxene (Fs_27.7–56.5Wo_2.7–40.2).

Classification: Achondrite (eucrite, polymict) with a high degree of shock and moderate degree of weathering.

Specimens: A 3.45 g type specimen and one polished thin section are on deposit at MNB. HSSH-Pirmasens of Germany holds the main mass.

Data from:
  MB90
  Table 2
  Line 245:

Place of purchase:	Morocco
Date:	2005
Mass (g):	17.2
Pieces:	1
Class:	Euc
Shock stage:	High
Weathering grade:	moderate
Type spec mass (g):	3.5

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)

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 7820 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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