Meteoritical Bulletin: Entry for Northwest Africa 10493

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Northwest Africa 10493

Basic information

Name: Northwest Africa 10493
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10493
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 48.9 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	CO3.0
Recommended:			CO3.0 [explanation]

This is 1 of 22 approved meteorites classified as CO3.0. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 3 Feb 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10493 (NWA 10493)

(Northwest Africa)

Purchased: 2013 Mar

Classification: Carbonaceous chondrite (CO3.0)

History: Purchased in Spain by Darryl Pitt in March 2013 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Small, well-formed chondrules (apparent diameter 0.45 ± 0.3 mm; one 1.8 mm), mineral fragments and sparse, irregularly-shaped CAI are set in a deep brown matrix (~40 vol.%). Accessory phases include Al-free chromite, kamacite and pentlandite.

Geochemistry: Olivine (Fa_0.5-87.4, Cr₂O₃ in ferroan olivine 0.29-0.67 wt.%, mean 0.40 wt.%, sd 0.10 wt.%, N = 20), orthopyroxene (Fs_1.2-1.4Wo_0.8-0.7, N = 2), clinopyroxene (Fs_1.9Wo_42.9; Fs_1.0Wo_49.3, N = 2).

Classification: Carbonaceous chondrite (CO3.0). The mean and range of Cr₂O₃ contents of ferroan olivine occurring as rims and as matrix grains is essentially the same as for Colony, which was designated as a CO3.0 by Grossman and Brearley (2005, Figure 5).

Specimens: 10.05 g including one polished thin section at UWB; remainder with DPitt.

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:
  MB105
  Table 0
  Line 0:

Place of purchase:	Spain
Date:	P 2013 Mar
Mass (g):	48.9
Pieces:	1
Class:	CO3.0
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	0.5-81.5
Ferrosilite (mol%):	1.2-1.4
Wollastonite (mol%):	0.8-0.7
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	10.05
Type spec location:	UWB
Main mass:	D. Pitt
Comments:	DP 734; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9092 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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