Meteoritical Bulletin: Entry for Northwest Africa 8355

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Northwest Africa 8355

Basic information

Name: Northwest Africa 8355
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8355
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 680 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	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 26 Jan 2017

Writeup

help

Writeup from MB 106:

Northwest Africa 8355 (NWA 8355)

(Northwest Africa)

Purchased: 2014 Feb

Classification: Ordinary chondrite (L3)

History: Purchased by Marcin Cimała in February 2014 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Closely-packed, medium-sized (apparent diameter 600±200 μm), well-formed chondrules. Minerals are olivine, orthopyroxene, subcalcic augite, sodic plagioclase, altered kamacite, troilite, chromite and taenite.

Geochemistry: Olivine (Fa_15.8-25.5, N = 5; Cr₂O₃ content of ferroan olivine <0.02 wt.%), orthopyroxene (Fs_11.9-35.4Wo_0.4-4.3, N = 3), subcalcic augite (Fs_11.0-26.6Wo_34.8-27.0, N = 2). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 4.65.

Classification: Ordinary chondrite (L3). Subtype estimated to be L3.8 based on the limited range in fayalite content of olivine and paucity of Cr₂O₃ in ferroan olivine (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:
  MB106
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2014 Feb
Mass (g):	680
Pieces:	1
Class:	L3
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	15.8-25.5
Ferrosilite (mol%):	11.9-35.4
Wollastonite (mol%):	0.4-4.3
Magnetic suscept.:	4.65
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.1
Type spec location:	UWB
Main mass:	M. Cimala
Comments:	MC115; 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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

Find references in NASA ADS:
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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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