Meteoritical Bulletin: Entry for Northwest Africa 10899

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Northwest Africa 10899

Basic information

Name: Northwest Africa 10899
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10899
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 514 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	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 21 Nov 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10899 (NWA 10899)

(Northwest Africa)

Purchased: 2015

Classification: Carbonaceous chondrite (CO3.2)

History: Purchased in 2015 by Brahim Tahiri in Morocco and sent to his partner Sean Tutorow for analysis.

Physical characteristics: Nine identical appearing stones. Weathered fusion crust exterior with numerous sub-millimeter chondrule outlines. A saw cut reveals many very small chondrules and a few small CAIs set in a dark brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules, many fragmental or irregular, most in the size range 50-200 μm. Scattered matrix olivines and CAIs were observed throughout. Fine grained matrix makes up approximately 40% of this meteorite.

Geochemistry: (C. Agee and M. Spilde, UNM) Olivine Fa_11.6±16.3, Fe/Mn=68±39, Cr₂O₃=0.11±0.06 (wt%), n=15; low-Ca pyroxene Fs_3.3±3.5Wo_1.7±1.2, Fe/Mn=13±4, n=6.

Classification: Carbonaceous chondrite (CO3.2), type 3.2 based on mean value and sigma of Cr₂O₃ in ferroan olivine (Grossman and Brearley, 2005), the values are similar to Rainbow and Kainsaz (CO3.2).

Specimens: 28.36 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:
  MB105
  Table 0
  Line 0:

Place of purchase:	Northwest Africa
Date:	P 2015
Mass (g):	514.27
Pieces:	9
Class:	CO3.2
Shock stage:	low
Weathering grade:	moderate
Fayalite (mol%):	11.6±16.3
Ferrosilite (mol%):	3.3±3.5
Wollastonite (mol%):	1.7±1.2
Classifier:	C. Agee, UNM
Type spec mass (g):	28.36
Type spec location:	UNM
Main mass:	Sean Tutorow
Comments:	Field name G673; 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. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Mike Markowitz

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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Revision
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