Meteoritical Bulletin: Entry for Northwest Africa 8398

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Northwest Africa 8398

Basic information

Name: Northwest Africa 8398
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8398
Observed fall: No
Year found: 2014
Country: Western Sahara
Mass: 9.4 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	CO3.2
Recommended:			CO3.2 [explanation]

This is 1 of 15 approved meteorites classified as CO3.2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 29 May 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8398 (NWA 8398)

Western Sahara

Found: 2014

Classification: Carbonaceous chondrite (CO3.2)

History: Found by a meteorite hunter on a 2014 Jan-Feb expedition in Western Sahara, and subsequently purchased by Darryl Pitt.

Physical characteristics: Single stone with dark weathered exterior. Saw cut reveals chondrules set in a dark brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules many in the range 50-300 μm, many metal/sulfide blebs, fine-grained matrix makes up about 30% of this meteorite.

Geochemistry: (C. Agee and N. Muttik, UNM) Ferroan chondrule olivine Fa_28.8±18.3, Fe/Mn=85±26, Cr₂O₃=0.12±0.09, n=41; low-Ca pyroxene Fs_47.5±6.4Wo_3.2±1.0, Fe/Mn=66±12, n=4; enstatite Fs_3.1±1.9Wo_1.3±1.0, n=11; aluminous diopside and diopside found.

Classification: Carbonaceous chondrite (CO3.2) based on mean value and sigma of Cr₂O₃ in ferroan olivine, similar values to Rainbow (CO3.2) as reported in Grossman and Brearley (2005).

Specimens: 2.3 g including a probe mount on deposit at UNM, DPitt 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:

Date:	2014
Mass (g):	9.4
Pieces:	1
Class:	CO3.2
Fayalite (mol%):	28.8±18.3
Ferrosilite (mol%):	3.1±1.9, 47.5±6.4
Wollastonite (mol%):	1.3±1.0, 3.2±1.0
Classifier:	C. Agee, UNM
Type spec mass (g):	2.3
Type spec location:	UNM
Main mass:	D. Pitt
Comments:	Field name MAC 0027; submitted by C. Agee, UNM

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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; 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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Geography:

Western Sahara

Western Sahara

Coordinates:

Unknown.

Statistics:
This is 1 of 280 approved meteorites from Western Sahara (plus 20 unapproved names)

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Revision
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