Meteoritical Bulletin: Entry for Northwest Africa 10685

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Northwest Africa 10685

Basic information

Name: Northwest Africa 10685
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10685
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 34 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	CK4
Recommended:			CK4 [explanation]

This is 1 of 121 approved meteorites classified as CK4. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites

Comments:

Approved 10 Apr 2017

Writeup

Writeup from MB 106:

Northwest Africa 10685 (NWA 10685)

(Northwest Africa)

Purchased: 2016 Mar

Classification: Carbonaceous chondrite (CK4)

History: Purchased in Temara, Morocco by Adam Aaronson in March 2016.

Petrography: (A. Irving, UWS) Separated chondrules containing Cr-magnetite are set in a dominant, relatively coarse grained matrix. Minerals are olivine, clinopyroxene, intermediate plagioclase and Cr-magnetite, plus minor orthopyroxene, chlorapatite and calcite.

Geochemistry: (P. Carpenter, WUSL; S. Kuehner, UWS) Olivine (Fa_25.0-26.7, FeO/MnO=70-76, N = 4), orthopyroxene (Fs_23.2-25.2Wo_0.4-1.9, N = 4), clinopyroxene (Fs_6.7-8.0Wo_47.8-47.0, N = 2), plagioclase (An_40.3Or_1.6).

Classification: Carbonaceous chondrite (CK4). The composition of olivine and pyroxene is unusual for a CK, although other CKs are in this range.

Specimens: 6.8 g including one polished thin section at UWB; remainder with Aaronson.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Temara
Date:	P 2016 Mar
Mass (g):	34
Pieces:	1
Class:	CK4
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	26.6-26.7
Ferrosilite (mol%):	23.2-25.2; 8.0
Wollastonite (mol%):	0.4-1.9; 47.0
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	6.8
Type spec location:	UWB
Main mass:	A. Aaronson
Comments:	M1913; 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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

Catalogs:

References:

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

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Public domain photographs:
A. Irving

Geography:

Coordinates:

Unknown.

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

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