Meteoritical Bulletin: Entry for Northwest Africa 6862

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Northwest Africa 6862

Basic information

Name: Northwest Africa 6862
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6862
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 39.4 g

Classification
history:

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

This is 1 of 636 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 6862 (NWA 6862)

Northwest Africa

Purchased: Feb 2011

Classification: Carbonaceous chondrite (CM2)

Petrography: Small granular chondrules (composed mainly of olivine, orthopyroxene, pigeonite and augite) in a dark reddish-brown matrix composed mainly of intergrown cronstedtite-tochilinite, Cr-bearing kamacite and chromite.

Geochemistry: Olivine Fa_0.4-70.3, orthopyroxene Fs_1.1Wo_0.9, pigeonite Fs_0.9Wo_5.5, augite Fs_1.0-1.5Wo_37.7-36.3.Oxygen isotopes (R. Tanaka, OkaU): acid-washed samples analyzed in duplicate by laser fluorination gave, respectively: δ¹⁷O = 1.139, -0.436; δ¹⁸O = 8.610, 6.867; Δ¹⁷O = -3.380, -4.042 per mil. These values plot along the trend for CM chondrites.

Data from:
  MB100
  Table 1
  Line 1517:

Place of purchase:	Tuscon
Date:	P Feb 2011
Mass (g):	39.4
Pieces:	1
Class:	CM2
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	0.4-70.3
Ferrosilite (mol%):	1.1
Wollastonite (mol%):	0.9
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	8.6
Type spec location:	UWS
Main mass:	M. Bandli
Comments:	B266; submitted by A. Irving

Plots:

O isotopes:

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)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)

Catalogs:

References:

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

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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