Meteoritical Bulletin: Entry for Northwest Africa 4945

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Northwest Africa 4945

Basic information

Name: Northwest Africa 4945
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4945
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass: 3.15 kg

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	EL6
Recommended:			EL6 [explanation]

This is 1 of 133 approved meteorites classified as EL6. [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites

Comments:

Approved 16 Sep 2011

Writeup

help

Writeup from MB 100:

Northwest Africa 4945 (NWA 4945)

(Northwest Africa)

Purchased: 2007 March

Classification: Enstatite chondrite (EL6)

History: Purchased from a dealer in Agadir, Morocco, by Jack Schrader in March 2007

Physical characteristics: An unweathered stone weighing 3150 g coated with dark brown, satiny fusion crust

Petrography: (A. Irving and S. Kuehner, UWS): Fine grained aggregate of predominantly enstatite (74 vol%), kamacite (8 vol%) and Cr-bearing troilite (8 vol.%), with accessory diopside, oldhamite, alabandite and tabular graphite plates. Daubreelite and schreibersite are absent. Sparse relict, partial RP chondrules and recrystallized chondrules.

Geochemistry: Orthopyroxene (Fs_0.1-0.3Wo_1.5-1.4), clinopyroxene (Fs_0.2-0.9Wo_45.9), kamacite (7.2 wt.% Ni, 1.0 wt.% Si, 0.5 wt.% Co), troilite (0.3 wt.% Ti, 2.6 wt.% Cr, 0.8 wt.% Mn), alabandite (1.0 wt.% Cr, 26.7 wt.% Fe, 21.6 wt.% Mn, 7.5 wt.% Mg, 1.3 wt.% Ca)

Classification: Enstatite chondrite (EL6, S1, W0). Paired with Northwest Africa 4946.

Specimens: A total of 20.3 g of type material and one polished thin section are on deposit at UWS; a further 20 g of the same stone and one polished thin section are on deposit at BathO. The main mass is held by MFarmer.

Data from:
  MB100
  Table 1
  Line 1205:

Place of purchase:	Agadir
Date:	P 2007 March
Mass (g):	3150
Pieces:	1
Class:	EL6
Shock stage:	S1
Weathering grade:	W0
Ferrosilite (mol%):	0.2-0.9
Wollastonite (mol%):	45.9
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.3
Type spec location:	UWS
Main mass:	MFarmer
Comments:	Submitted by A. Irving

Institutions
and collections

BathO: Bathurst Observatory Research Facility, 624 Limekilns Road, Kelso NSW 2795, Australia (institutional address; updated 27 Jul 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

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

Geography:

Coordinates:

Unknown.

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

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