Meteoritical Bulletin: Entry for Northwest Africa 8303

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Northwest Africa 8303

Basic information

Name: Northwest Africa 8303
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8303
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 916 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	L3
Recommended:			L3 [explanation]

This is 1 of 811 approved meteorites (plus 1 unapproved name) classified as L3. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 28 Oct 2015

Writeup

Writeup from MB 104:

Northwest Africa 8303 (NWA 8303)

(Northwest Africa)

Purchased: 2013 Feb

Classification: Ordinary chondrite (L3)

History: Purchased by Marcin Cimała in February 2013 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Closely-packed, medium sized, well-formed chondrules (most 0.6-2.8 mm, some up to 4 mm, mean 1.8±1.2mm). Minerals are olivine, orthopyroxene, clinopyroxene, sodic plagioclase, altered kamacite, troilite and chromite.

Geochemistry: Olivine (Fa_3.9-32.7, N = 10; Cr₂O₃ content of ferroan olivine = 0.02±0.02 wt.%, N = 8), orthopyroxene (Fs_2.5-8.7Wo_0.3-0.5, N = 3), clinopyroxene (Fs_3.3-5.2Wo_41.9-46.0)

Classification: Ordinary chondrite L3. Estimation of subtype 3.6 based on histograms of Cr₂O₃ distribution in ferroan olivine given in Fig. 4 of Grossman and Brearley (2005).

Specimens: 20.2 g including one polished thin section at UWB. The remainder is held by M. Cimała.

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB104
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2013 Feb
Mass (g):	916
Pieces:	1
Class:	L3
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	3.9-32.7
Ferrosilite (mol%):	2.5-8.7
Wollastonite (mol%):	0.3-0.5
Magnetic suscept.:	4.62
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.2
Type spec location:	UWB
Main mass:	M. Cimala
Comments:	MC100; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

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)
Woreczko Jan & Wadi

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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