Meteoritical Bulletin: Entry for Northwest Africa 6870

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Northwest Africa 6870

Basic information

Name: Northwest Africa 6870
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6870
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 1950 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	CV3
Recommended:			CV3 [explanation]

This is 1 of 612 approved meteorites (plus 1 unapproved name) classified as CV3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites

Comments:

Approved 17 Feb 2017

Writeup

Writeup from MB online:

Northwest Africa 6870 (NWA 6870)

(Northwest Africa)

Purchased: 2011 May

Classification: Carbonaceous chondrite (CV3)

History: Purchased by Greg Catterton in May 2011 from a dealer in Ouarzazate, Morocco.

Physical characteristics:

Petrography: (A. Irving and S. Kuehner, UWS) Round to irregular-shaped chondrules (mostly granular, some rimmed) and fine grained CAIs are set in a dark brown matrix.

Geochemistry: Olivine (Fa_1.0-32.7), orthopyroxene (Fs_0.9-1.1Wo_1.1-0.8), augite (Fs_1.0Wo_38.5); diopside in one CAI is Fs_0.2Wo_50.2.Oxygen isotopes of acid-washed subsamples: d17O -6.880, -7.446; d18O -2.347, -3.062; D17O -5.665, -5.858 per mil (Ryoji Tanaka, Okayama University).

Classification: Carbonaceous chondrite (CV3).

Specimens: 20 g including one polished thin section at UWB; remainder with Mr. G. Catterton.

Writeup from MB 106:

Northwest Africa 6870 (NWA 6870)

Northwest Africa

Purchased: 2011 May

Classification: Carbonaceous chondrite (CV3)

History: Purchased by Greg Catterton in May 2011 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Round to irregular-shaped mm-sized chondrules (mostly granular, some rimmed) and fine grained CAIs are set in a dark brown matrix.

Geochemistry: Olivine (Fa_1.0, Fa_32.7, N=2), orthopyroxene (Fs_0.9Wo_1.1, Fs_1.1Wo_0.8, 0.8, N=2), augite (Fs_1.0Wo_38.5, N=1); diopside in one CAI is Fs_0.2Wo_50.2(N=1). Oxygen isotopes of acid-washed subsamples: δ¹⁷O -6.880, -7.446; δ¹⁸O -2.347, -3.062; Δ¹⁷O -5.665, -5.858 per mil (Ryoji Tanaka, OkaU).

Classification: Carbonaceous chondrite (CV3).

Specimens: 20 g including one polished thin section at UWB; 26.6 g and two polished mounts at App; remainder with Mr. G. Catterton.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Ouarzazate
Date:	P 2011 May
Mass (g):	1950
Pieces:	29
Class:	CV3
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	1.0, 32.7 (N=2)
Ferrosilite (mol%):	0.9, 1.1 (N=2)
Wollastonite (mol%):	1.1, 0.8
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20
Type spec location:	UWB
Main mass:	G. Catterton
Comments:	GC11-2; 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)
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)

Catalogs:

References:

Published in
Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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