Meteoritical Bulletin: Entry for Northwest Africa 10916

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Northwest Africa 10916

Basic information

Name: Northwest Africa 10916
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10916
Observed fall: No
Year found: 2013
Country: Morocco
Mass: 25.8 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 26 Nov 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10916 (NWA 10916)

Morocco

Purchased: 2013

Classification: Carbonaceous chondrite (CO3.0)

History: Purchased by G. Catterton (Boone, North Carolina) from an unknown Moroccan dealer in early (March?) 2013. Subsequently sold to the owner in April 2013.

Physical characteristics: A single stone partially covered in dark brown fusion crust. Saw cut reveals many small chondrules and some light-colored CAIs in a dark gray-brown matrix.

Petrography: (C. Herd, UAb) Microprobe and petrographic examination of thin section shows numerous chondrules in the range 50-750 μm (most ~200 μm), with CAIs/AOAs and isolated olivine and pyroxene grains observed throughout. Sulfides are present, but rare. Small amount of FeNi metal was found as grains up to about 250 um in the matrix, as well as small grains as inclusions in Type I olivine. Matrix ~35% of mode (estimated).

Geochemistry: (C. Herd and S. Kampel, UAb) All olivine Fa_25±20(n=55); ferroan olivine (chondrule and isolated grains) Fa_32±18, Cr₂O₃=0.40±0.07 (n=42); low-Ca pyroxene (Type II chondrules) Fs_18±13Wo_0.8±0.8(n=19).

Classification: Carbonaceous chondrite (CO3.0), type 3.0 based on the mean value and standard deviation of Cr₂O₃ in ferroan olivine (Grossman and Brearley, 2005); these values are similar to ALHA77307.

Specimens: A 6.6 g specimen, including one thin section, is at UAb. Main mass is with the owner.

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:	Erfoud, Morocco
Date:	P 2013
Mass (g):	25.8
Pieces:	1
Class:	CO3.0
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	25±20 (n=55)
Ferrosilite (mol%):	12±13 (n=29)
Wollastonite (mol%):	0.9±0.6 (n=29)
Classifier:	C. Herd, UAb
Type spec mass (g):	6.6
Type spec location:	UAb
Main mass:	John Shea
Comments:	Submitted by C. Herd

Institutions
and collections

UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)

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:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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Revision
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