Meteorite NWA 11455 - Unbrecciated Microgabbroic Eucrite

Description

NWA 11455
NWA 11455
Found Sahara, 2017
Achondrite, Vestan
Eucrite
Microgabbroic, Unbrecciated
Specimen is a 2.43g endcut
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Microgabbroic texture. Major minerals are exsolved pigeonite and calcic plagioclase (as equant grains, mean grainsize ~0.7 mm).
Northwest Africa 11455
Basic information
Name:
Northwest Africa 11455
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 11455
Observed fall:
No
Year found:
2017
Country:
(Northwest Africa)
Mass:
263 g
Classification
history:
Recommended:
Eucrite-unbr
This is 1 of 72 approved meteorites classified as Eucrite-unbr.
Comments:
Approved 13 Oct 2017
Writeup
Writeup from MB 106:
Northwest Africa 11455
(NWA 11455)
(Northwest Africa)
Purchased: 2017 Apr
Classification: HED achondrite (Eucrite, unbrecciated)
History
: Purchased by Fabien
Kuntz
in April 2017 from a dealer in Erfoud, Morocco.
Petrography
: (A. Irving and S. Kuehner,
UWS
) Microgabbroic texture. Major minerals are exsolved pigeonite and calcic plagioclase (as equant grains, mean grainsize ~0.7 mm); accessory minerals include silica polymorph, ilmenite, chromite, troilite and Ni-poor metal.
Geochemistry
: Host orthopyroxene (Fs
59.1
Wo
2.6
, FeO/MnO = 29), clinopyroxene exsolution lamella (Fs
27.5
Wo
41.3
, FeO/MnO = 28), host clinopyroxene (Fs
27.6
Wo
42.5
, FeO/MnO = 28), orthopyroxene exsolution lamella (Fs
60.7
Wo
2.3
, FeO/MnO = 30), plagioclase (An
89.7-89.8
Or
0.5-0.6
, N = 2).
Classification
: Unbrecciated eucrite (microgabbroic).
Specimens
: 20.55 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):
262.6
Pieces:
1
Class:
Eucrite-unbr
Shock stage:
low
Weathering grade:
low
Ferrosilite (mol%):
59.1; 27.5; 27.6; 60.7
Wollastonite (mol%):
2.6; 41.3; 42.5; 2.3
Classifier:
A. Irving and S. Kuehner, UWS
Type spec mass (g):
20.55
Type spec location:
PSF
Main mass:
F. Kuntz
Comments:
Work name K361; 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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