Meteoritical Bulletin: Entry for Northwest Africa 10705

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Northwest Africa 10705

Basic information

Name: Northwest Africa 10705
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10705
Observed fall: No
Year found: 2016
Country: Western Sahara
Mass: 33.7 g

Classification
history:

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

This is 1 of 614 approved meteorites (plus 1 unapproved name) classified as CO3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 16 Oct 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10705 (NWA 10705)

Western Sahara

Purchased: Jan 2016

Classification: Carbonaceous chondrite (CO3)

History: Purchased in January 2016; reportedly found in El-Hamada, November 2015.

Physical characteristics: Single stone. Weathered fusion-crusted exterior. A saw cut reveals many small chondrules in a brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules, most fragmental or irregular, apparent mean diameter 110±70 μm (n=30). Approximately >95% of the chondrules are FeO-poor, Type I. One CAI (~2000 × 1000 μm) was observed in the probe section. Fine-grained matrix makes up about 50% of this meteorite.

Geochemistry: (C. Agee and M. Spilde, UNM) All chondrule olivine Fa_1.2±1.3, Cr₂O₃=0.31±0.20, n=21; ferroan chondrule olivine (>2 wt.% FeO) Fa_3.3±2.0, Cr₂O₃=0.57±0.08, n=4; low-Ca pyroxene Fs_2.4±2.2Wo_1.3±1.1, n=11; aluminous diopside Fs_1.3Wo_42.9, Al₂O₃=6.3 wt%, n=1.

Classification: Carbonaceous chondrite (CO3), with an estimated sub-type of 3.0 based on mean value and sigma of Cr₂O₃ in ferroan olivine (n=4) (Grossman and Brearley, 2005).

Specimens: 7 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:
  MB105
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P Jan 2016
Mass (g):	33.7
Pieces:	1
Class:	CO3
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	1.2±1.3
Ferrosilite (mol%):	2.4±2.2
Wollastonite (mol%):	1.3±1.1
Classifier:	C. Agee, UNM
Type spec mass (g):	7
Type spec location:	UNM
Main mass:	DPitt
Comments:	Field name MCVICH034; 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. 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:

Western Sahara

Western Sahara

Coordinates:

Unknown.

Statistics:
This is 1 of 259 approved meteorites from Western Sahara (plus 20 unapproved names)

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