Meteoritical Bulletin: Entry for Northwest Africa 10718

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Northwest Africa 10718

Basic information

Name: Northwest Africa 10718
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10718
Observed fall: No
Year found: 2015
Country: Mauritania
Mass: 17.4 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	CO3.0
Recommended:			CO3.0 [explanation]

This is 1 of 22 approved meteorites classified as CO3.0. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 20 Jun 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10718 (NWA 10718)

Mauritania

Purchased: 2015 Dec 1

Classification: Carbonaceous chondrite (CO3.0)

History: Purchased 1 Dec 2015 in Mauritania. Recovered from near the border region of Western Sahara, Mauritania and Algeria.

Physical characteristics: Single stone. Weathered fusion crust exterior, small chondrule pits, saw cut reveals many small chondrules and some CAIs in a dark-gray 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, metal/sulfide blebs, and CAIs were observed throughout.

Geochemistry: (C. Agee and M. Spilde, UNM) All olivine Fa_15.6±17.1, Fe/Mn=55±33, Cr₂O₃=0.28±0.12, n=22; ferroan chondrule olivine Fa_22.3±16.9, Fe/Mn=67±30, Cr₂O₃=0.34±0.11, n=14; low-Ca pyroxene Fs_4.6±2.1Wo_2.9±1.1, n=6; aluminous diopside Fs_1.3Wo_43.4, n=1.

Classification: Carbonaceous chondrite (CO3.0), type 3.0 based on mean value and sigma of Cr₂O₃ in ferroan olivine (Grossman and Brearley, 2005), these values are similar to Acfer 094 and MIL 07687 (Davidson et al., 2014).

Specimens: 4 g including a probe mount on deposit at UNM, DPitt holds the main mass.

Bibliography:

Davidson J., Nittler L. R., Alexander C. M. O’D., and Stroud R. M. (2014) Petrography of Very Primitive CO3 Chondrites: Dominion Range 08006, Miller Range 07687, and Four Others. 45th Lunar and Planetary Science Conference, Abstract 1384. (link)
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:	Mauritania
Date:	P 2015 Dec 1
Mass (g):	17.4
Pieces:	1
Class:	CO3.0
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	15.6±17.1
Ferrosilite (mol%):	4.6±2.1
Wollastonite (mol%):	2.9±1.1
Classifier:	C. Agee, UNM
Type spec mass (g):	4
Type spec location:	UNM
Main mass:	DPitt
Comments:	Field name MCVICH020; 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)
LPI: Lunar and Planetary Institute, 3600 Bay Area Blvd., Houston, TX 77058 , United States; Website (institutional address; updated 20 Jun 2022)

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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Geography:

Mauritania

Mauritania

Coordinates:

Unknown.

Statistics:
This is 1 of 195 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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