Meteorite NWA 11957 - Granular chondrules, very fine grained CAI - CV3

Description

NWA 11957
NWA 11957
Found 2018
Carbonaceous Chondrite
CV3
Specimen is a 2.29g slice
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Granular chondrules (apparent diameter 950±450 µm) and irregularly-shaped, very fine grained CAI are set in a fine grained matrix (~40 vol.%, deep sepia brown in thin section).
Northwest Africa 11957
Basic information
Name:
Northwest Africa 11957
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 11957
Observed fall:
No
Year found:
2018
Country:
(Northwest Africa)
Mass:
251 g
Classification
history:
Recommended:
CV3
This is 1 of 466 approved meteorites classified as CV3.
Comments:
Approved 15 Sep 2018
Writeup
Writeup from MB 107:
Northwest Africa 11957
(NWA 11957)
(Northwest Africa)
Purchased: 2018 Mar
Classification: Carbonaceous chondrite (CV3)
History
: Purchased by Fabien
Kuntz
in March 2018 from a dealer in Zagora, Morocco.
Petrography
: (A. Irving and S. Kuehner,
UWS
) Granular chondrules (apparent diameter 950±450 µm) and irregularly-shaped, very fine grained CAI are set in a fine grained matrix (~40 vol.%, deep sepia brown in thin section).
Geochemistry
: Olivine (Fa
1.2-58.7
, N = 3), orthopyroxene (Fs
1.1-1.2
Wo
0.7-4.2
, N = 3), clinopyroxene (Fs
0.6
Wo
46.7
; Fs
0.8-1.0
Wo
50.0-49.5
, N = 3).
Classification
: Carbonaceous chondrite (CV3).
Specimens
: 21.82 g including one polished thin section at
UWB
; remainder with
Kuntz
.
Data from:
MB107
Table 0
Line 0:
Place of purchase:
Zagora
Date:
P 2018 Mar
Mass (g):
251
Pieces:
several
Class:
CV3
Shock stage:
S2
Weathering grade:
moderate
Fayalite (mol%):
1.2-58.9
Ferrosilite (mol%):
1.1-1.2
Wollastonite (mol%):
0.7-4.2
Classifier:
A. Irving and S. Kuehner, UWS
Type spec mass (g):
21.82
Type spec location:
UWB
Main mass:
FKuntz
Comments:
Work name K386; 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)
UWB
: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Kuntz
: Fabien Kuntz, France;
Website
(private address)
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