Meteoritical Bulletin: Entry for Northwest Africa 4645

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Northwest Africa 4645

Basic information

Name: Northwest Africa 4645
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4645
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 56.6 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	L(LL)3
Recommended:			L(LL)3 [explanation]

This is 1 of 16 approved meteorites classified as L(LL)3. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 11 Jun 2012

Writeup

Writeup from MB 100:

Northwest Africa 4645 (NWA 4645)

Northwest Africa

Purchased: 2006

Classification: Ordinary chondrite (L(LL)3)

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 brownish fragment of 56.6 g partly covered with fusion crust.

Petrography: The meteorite is an unbrecciated chondrite with a fresh gray appearance in its interior. The chondrules are well defined and of large variation in the textural types. Olivine and pyroxene are unequilibrated. Mean chondrule size ~0.8 mm; meteorite has a high chondrule/matrix ratio and low metal content.

Geochemistry: Olivine Fa_8.7-26.1; pyroxene Fs_2.5-20.2.

Classification: Ordinary chondrite L(LL)3, S2, W1.

Specimens: 12.8 g plus one polished thin section are on deposit at MNB.

Data from:
  MB100
  Table 1
  Line 1202:

Place of purchase:	Erfoud, Morocco
Date:	P 2006
Mass (g):	56.6
Pieces:	1
Class:	L(LL)3
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	17.1±6.8 (8.7-26.1, n=15)
Ferrosilite (mol%):	10.5±7.7 (2.5-20.2, n=10)
Classifier:	Ansgar Greshake, MNB
Type spec mass (g):	12.8
Type spec location:	MNB
Main mass:	Hanno Strufe
Comments:	Submitted by Ansgar Greshake

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. 100, MAPS 49, E1-E101 (2014)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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