Meteoritical Bulletin: Entry for Northwest Africa 8345

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Northwest Africa 8345

Basic information

Name: Northwest Africa 8345
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8345
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 986 g

Classification
history:

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

This is 1 of 13 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 27 Apr 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8345 (NWA 8345)

(Northwest Africa)

Purchased: 2013

Classification: Carbonaceous chondrite (CO3.2)

History: Purchased by Sean Tutorow from a Moroccan dealer in Quartzsite, Arizona, January 2013.

Physical characteristics: Three pieces that fit together, partial black fusion crust, saw cut reveals many sub-mm chondrules and sparse small CAIs set in a dark gray-brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous, small (50-400 μm) unequilibrated chondrules, many are porphyritic, fine grained matrix makes up approximately 30% of this meteorite. Melilite, anorthite, Ti-rich aluminous diopside, aluminous diopside, aluminous enstatite, aluminous low-Ca pyroxene, augite, troilite and Fe-Ni metal detected.

Geochemistry: (C. Agee and N. Muttik, UNM) Type I chondrules: olivine Fa_1.3±0.4, n=7; enstatite Fs_1.9.±1.7Wo_0.8±1.6, n=6. Type II chondrules: olivine Fa_31.5±17.6, Fe/Mn=91±26, Cr₂O₃=0.14±0.09 wt%, n=23; low-Ca pyroxene Fs_5.5±4.3Wo_1.6±1.3, n=6.

Classification: Carbonaceous chondrite (CO3.2). Type 3.2 based on mean value and sigma of Cr₂O₃ in ferroan chondrule olivines, as given by Grossman and Brearley (2005).

Specimens: 21 g including a probe mount on deposit at UNM, Sean Tutorow 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):	986.14
Pieces:	3
Class:	CO3.2
Fayalite (mol%):	1.3±0.4, 31.5±17.6
Ferrosilite (mol%):	1.9.±1.7, 5.5±4.3
Wollastonite (mol%):	0.8±1.6, 1.6±1.3
Classifier:	C. Agee, UNM
Type spec mass (g):	21
Type spec location:	UNM
Main mass:	Sean Tutorow
Comments:	Field name G513; 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)

Catalogs:

References:

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

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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