Meteoritical Bulletin: Entry for Northwest Africa 4642

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Northwest Africa 4642

Basic information

Name: Northwest Africa 4642
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4642
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass: 483 g

Classification
history:

Meteoritical Bulletin:	MB 94	(2008)	Enstatite achondrite
Recommended:			Enst achon [explanation]

This is 1 of 12 approved meteorites classified as Enst achon. [show all]
Search for other: Achondrites, Enstatite achondrites, and Enstatite-rich meteorites

Comments:

Approved 16 Dec 2008

Writeup

Writeup from MB 94:

Northwest Africa 4642

Northwest Africa

Find: 2006

Enstatite achondrite

History: The meteorite was found by an anonymous finder in northwest Africa and bought by the main mass holder in Erfoud, Morocco.

Physical characteristics: One fragment of 483.2 g partly covered with fusion crust was found.

Petrography: (A. Greshake, MNB) The meteorite predominantly consists of subhedral enstatite grains. Minor phases include feldspar, Fe-Cr-sulfides, and rare Fe,Ni-metal; no chondrules were found.

Geochemistry: Pyroxene, Fs_0–1.2. Oxygen Isotopes (I. A. Franchi and R. C. Greenwood, OU): δ¹⁷O = 2.975‰, δ¹⁸O = 5.614‰, Δ¹⁷O = 0.056‰.

Classification: Enstatite achondrite; low degree of shock, moderate degree of weathering.

Type specimens: A total of 22.6 g and one polished thin section are on deposit at MNB. HSSH holds the main mass.

Data from:
  MB94
  Table 2
  Line 49:

State/Prov/County:	Morocco
Date:	2006
Mass (g):	483.2
Pieces:	1
Class:	Enstatite achondrite
Ferrosilite (mol%):	0-1.2
Classifier:	A. Greshake, MNB
Type spec mass (g):	22.6
Type spec location:	MNB
Main mass:	HSSH
Comments:	δ17O = 2.975‰, δ18O = 5.614‰, Δ17O = 0.056‰.

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)
HSSH: Hanno Strufe, Langenbergstr. 32, 66954 Pirmasens, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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