NWA 11454 - Diogenite Polymict - Angular Opx fragm. + Harzburgitic Diogenite...

Description

NWA 11454
NWA 11454
Found Sahara, 2017
Achondrite, Vestan
Diogenite Polymict
Specimen is a 1.71g slice
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Northwest Africa 11454
Basic information
Name:
Northwest Africa 11454
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 11454
Observed fall:
No
Year found:
2017
Country:
(Northwest Africa)
Mass:
352 g
Classification
history:
Recommended:
Diogenite-pm
This is 1 of 37 approved meteorites classified as Diogenite-pm.
Comments:
Approved 13 Oct 2017
Writeup
Writeup from MB 106:
Northwest Africa 11454
(NWA 11454)
(Northwest Africa)
Purchased: 2017 Apr
Classification: HED achondrite (Diogenite, polymict)
History
: Purchased by Fabien
Kuntz
in April 2017 from a dealer in Erfoud, Morocco.
Petrography
: (A. Irving and S. Kuehner,
UWS
)
Breccia consisiting mostly of angular grains of diogenitic orthopyroxene (exhibiting undulose extinction) plus sparse harzburgitic diogenite
clasts and rare subophitic eucrite clasts set in a sparse finer grained matrix. Other minerals are exsolved pigeonite, calcic plagioclase, silica polymorph (some rimmed by orthopyroxene+olivine), chromite, ilmenite, merrillite and troilite.
Geochemistry
: Diogenitic orthopyroxene (Fs
26.3
Wo
5.2
; Fs
31.9
Wo
3.70
; FeO/MnO = 28-30; N = 2), host orthopyroxene (Fs
52.5-53.1
Wo
3.1-3.2
, FeO/MnO = 28-29, N = 2), clinopyroxene exsolution lamellae (Fs
21.7-26.3
Wo
43.7-42.0
, FeO/MnO = 26-28, N = 2), orthopyroxene rim on silica grain (Fs
32.5
Wo
1.1
, FeO/MnO = 34), olivine rim on silica grain (Fa
44.5
, FeO/MnO = 55), olivine (Fa
51.8-52.5
, FeO/MnO = 49, N = 2), plagioclase (An
90.1-93.7
Or
0.6-0.4
, N = 2).
Classification
: Polymict diogenite breccia.
Specimens
: 21.11 g including one polished thin section at
PSF
; remainder with
Kuntz
.
Data from:
MB106
Table 0
Line 0:
Place of purchase:
Erfoud
Date:
P 2017 Apr
Mass (g):
352.3
Pieces:
1
Class:
Diogenite-pm
Shock stage:
low
Weathering grade:
low
Fayalite (mol%):
51.8-52.5
Ferrosilite (mol%):
26.3; 31.9; 52.5-53.1; 21.7-26.3
Wollastonite (mol%):
5.2; 3.7; 3.1-3.2; 43.7-42.0
Classifier:
A. Irving and S. Kuehner, UWS
Type spec mass (g):
21.11
Type spec location:
PSF
Main mass:
F. Kuntz
Comments:
Work name K348; submitted by A. Irving
Institutions
and collections
PSF
: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States;
Website
(institutional address; updated 1 Dec 2011)
UWS
: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz
: Fabien Kuntz, France;
Website
(private address)
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