Meteoritical Bulletin: Entry for Northwest Africa 6861

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Northwest Africa 6861

Basic information

Name: Northwest Africa 6861
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6861
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 10.3 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	CM2
Recommended:			CM2 [explanation]

This is 1 of 620 approved meteorites classified as CM2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites

Comments:

Approved 29 Nov 2011

Writeup

Writeup from MB 100:

Northwest Africa 6861 (NWA 6861)

Northwest Africa

Purchased: Feb 2011

Classification: Carbonaceous chondrite (CM2)

Petrography: Small granular and PO chondrules (composed primarily of olivine, orthopyroxene, pigeonite and augite), angular olivine grains and very sparse CAIs (to 3 mm) set in a black, fine-grained matrix composed mainly of intergrown cronstedtite-tochilinite, framboidal or porous troilite (some Ni-bearing) and taenite. One CAI is composed mainly of melilite and calcite with minor spinel.

Geochemistry: Olivine Fa_0.2-51.2, orthopyroxene Fs_1.4Wo_0.9, pigeonite Fs_1.0Wo_13.8, augite Fs_0.9-4.3Wo_38.1-38.3.

Data from:
  MB100
  Table 1
  Line 1516:

Place of purchase:	Tuscon
Date:	P Feb 2011
Mass (g):	10.3
Pieces:	1
Class:	CM2
Shock stage:	S2
Weathering grade:	W0
Fayalite (mol%):	0.2-51.2
Ferrosilite (mol%):	1.4
Wollastonite (mol%):	0.9
Classifier:	A. Irving and S. Kuehner, UWS; T. Bunch
Type spec mass (g):	2.1
Type spec location:	UWS
Main mass:	M. Bandli
Comments:	B265; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

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)
Gregor H.
Mirko Graul

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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