Lunar (Troctolite) NWA 13837 - Main mineral Olivine (+ Pyroxene and plagioclase)

Description

NWA 13837
NWA 13837
Found Sahara, 2020
Achondrite
Lunar Troctolite
Specimen is a 0.55g endcut
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Granular igneous rock with grain size 600 µm. The main mineral is olivine. Other minerals are pyroxene and plagioclase, accessory chromite and ilmenite (to 200 µm), minor troilite (100 µm) and kamacite (to 50 µm)
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From the Meteoritical society Database :
Northwest Africa 13837
Basic information
Name:
Northwest Africa 13837
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 13837
Observed fall:
No
Year found:
2020
Country:
(Northwest Africa)
Mass:
20.3 g
Classification
history:
Recommended:
Lunar (troct)
This is 1 of 2 approved meteorites classified as Lunar (troct).
[show all]
Comments:
Approved 25 Apr 2021
Writeup
Writeup from MB 110:
Northwest Africa 13837
(NWA 13837)
(Northwest Africa)
Purchased: 2020 Oct
Classification: Lunar meteorite (troctolite)
Physical characteristics
: Brownish stone. Interior is almost black.
Petrography
: (J. Gattacceca,
CEREGE
) Granular igneous rock with grain size 600 µm. The main mineral is olivine. Other minerals are pyroxene and plagioclase, accessory chromite and ilmenite (to 200 µm), minor troilite (100 µm) and kamacite (to 50 µm).
Geochemistry
: Olivine Fa
37.8±2.6
, FeO/MnO 111.2±18.4 (n=6). Pyroxene Fs
28.8±6.7
Wo
14.7±9.5
, FeO/MnO = 64.4±7.5 (n=4). Plagioclase An
84.8±5.1
Ab
13.8±3.8
Or
1.4±1.4
(n=8). Chromite Cr# = 0.77 (n=1).
Classification
: Achondrite (lunar troctolite)
Specimens
: Type specimen at
CEREGE
. Main mass with
Kuntz
.
Data from:
MB110
Table 0
Line 0:
Place of purchase:
Guelmin, Morocco
Date:
P 2020 Oct
Mass (g):
20.31
Pieces:
7
Class:
Lunar (troct)
Weathering grade:
low
Fayalite (mol%):
37.8±2.6 (n=6)
Magnetic suscept.:
3.01
Classifier:
J. Gattacceca, CEREGE
Type spec mass (g):
4.22
Type spec location:
CEREGE
Main mass:
Kuntz
Finder:
anonymous
Comments:
work name K509; submitted by Jérôme Gattacceca
Institutions
and collections
CEREGE
: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Kuntz
: Fabien Kuntz, France;
Website
(private address)
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