Lunar NWA 13426 - Felds. Breccia with Poikilitic, Basaltic and Brecciated clasts

Description

NWA 13426
NWA 13426
Found Sahara, 2020
Achondrite
Lunar Feldspathic Breccia
Specimen is a 1.63g endcut
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Sample is a breccia composed of rounded to angular 25.1-2241 μm (avg. length 272 μm, n=145) mineral grains and lithic
clasts with poikilitic, basaltic and brecciated textures set within a melt matrix
. Sample contains clear
glassy spheres, fragments and glassy schlieren textured objects
. Additional minerals are
FeNi grains
, a silica polymorph, chromite, ilmenite, titanomagnetite and troilite
From the Meteoritical society Database :
Northwest Africa 13426
Basic information
Name:
Northwest Africa 13426
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 13426
Observed fall:
No
Year found:
2020
Country:
(Northwest Africa)
Mass:
137.3 g
Classification
history:
Recommended:
Lunar
[explanation]
This is 1 of 89 approved meteorites classified as Lunar.
[show all]
Comments:
Approved 19 Sep 2020
Writeup
Writeup from MB 109:
Northwest Africa 13426
(NWA 13426)
(Northwest Africa)
Purchased: 2020
Classification: Lunar meteorite
History
: Many stones totaling 137.3 g were found and subsequently purchased from a meteorite prospector in Tindouf, Algeria, in March, 2020.
Physical characteristics
: Samples are coated with a layer of light-orange caliche, and have a dark-colored interior containing clastic crystalline debris.
Petrography
: Description and classification (A. Love,
App
): Sample is a breccia composed of rounded to angular 25.1-2241 μm (avg. length 272 μm, n=145) mineral grains and lithic clasts with poikilitic, basaltic and brecciated textures set within a melt matrix. Sample contains clear glassy spheres, fragments and glassy schlieren textured objects. Additional minerals are FeNi grains, a silica polymorph, chromite, ilmenite, titanomagnetite and troilite.
Geochemistry
: (A. Love,
App
) Olivine Fa
30.1±10.0
(Fa
19.7-40.5
, Fe/Mn=80.3±6.2, n=8); low-Ca pyroxene Fs
21.2±2.5
Wo
3.2±0.2
(Fs
19.5-23.0
Wo
3.1-3.4
, Fe/Mn=48.8±1.3, n=2); pigeonite Fs
32.4±4.9
Wo
11.6±3.9
(Fs
23.0-37.7
Wo
5.9-18.0
, Fe/Mn=51.9±2.8, n=5); high-Ca pyroxene Fs
29.1±7.7
Wo
29.7±4.0
(Fs
21.4-38.4
Wo
21.8-32.1
, Fe/Mn=54.0±5.9, n=6); plagioclase An
96.4±0.9
Or
0.2±0.2
(n=7).
Classification
: Lunar (feldspathic breccia). Based on textures, melt matrix component and mineral compositions, this sample is a feldspathic breccia.
Specimens
:
Kuntz
holds the main masses. A polished thin section and 10 fragments weighing 21.53 g are on deposit at
App
.
Data from:
MB109
Table 0
Line 0:
Place of purchase:
Tindouf, Algeria
Date:
P 2020
Mass (g):
137.3
Pieces:
many
Class:
Lunar
Shock stage:
moderate
Weathering grade:
low
Fayalite (mol%):
30.1±10.0
Ferrosilite (mol%):
21.2±2.5; 32.4±4.9; 29.1±7.7
Wollastonite (mol%):
3.2±0.2; 11.6±3.9; 29.7±4.0
Classifier:
A. Love, App
Type spec mass (g):
21.53
Type spec location:
App
Main mass:
Kuntz
Comments:
Submitted by Anthony Love
Institutions
and collections
App
: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Kuntz
: Fabien Kuntz, France;
Website
(private address)
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