Meteoritical Bulletin: Entry for Northwest Africa 8342

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Northwest Africa 8342

Basic information

Name: Northwest Africa 8342
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8342
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 167 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	CO3.1
Recommended:			CO3.1 [explanation]

This is 1 of 16 approved meteorites classified as CO3.1. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 23 Apr 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8342 (NWA 8342)

(Northwest Africa)

Purchased: 2013

Classification: Carbonaceous chondrite (CO3.1)

History: Purchased by F. Kuntz in Erfoud, Morocco, January 2013.

Physical characteristics: Single stone. Dark brown exterior, saw cut reveals scattered, very small chondrules set in a dark brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules up to 200 μm, fine-grained matrix makes up about 40% of this meteorite, some domains and chondrules appear sulfide/metal-rich.

Geochemistry: (C. Agee and N. Muttik, UNM) Type I chondrule olivine Fa_1.2±0.3, n=9; ferroan chondrule olivine Fa_36.3±15.0, Fe/Mn=97±27, Cr₂O₃=0.26±0.14 wt%, n=46; low-Ca pyroxene Fs_4.1±4.4Wo_2.3±1.2, Fe/Mn=18±11, n=15; aluminous diopside.

Classification: Carbonaceous chondrite (CO3.1) based on mean Cr₂O₃=0.26±0.14 wt% in ferroan olivines, values plotting closer to Colony (CO3.0) than to Rainbow (CO3.2) as reported by Grossman and Brearley (2005).

Specimens: 21.35 g including a probe mount on deposit at UNM, Kuntz holds the main mass.

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:
  MB103
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2013
Mass (g):	167
Pieces:	1
Class:	CO3.1
Fayalite (mol%):	1.2±0.3, 36.3±15.0
Ferrosilite (mol%):	4.1±4.4
Wollastonite (mol%):	2.3±1.2
Classifier:	C. Agee, UNM
Type spec mass (g):	21.35
Type spec location:	UNM
Main mass:	Fabien Kuntz
Comments:	Submitted by C. Agee

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Kuntz: Fabien Kuntz, France; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
David L. Ribeca
Denis gourgues
Piotr gural100

Geography:

Coordinates:

Unknown.

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

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Revision
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