Meteorite: Lunar Melt Breccia NWA 13757 Slice of 7.035 grams #528

Description

Meteorite: Lunar Melt Breccia NWA 13757 Slice of 7.035 grams #528
On Offer:
7.035
grams slice of
NWA 13757
Type:
Lunar meteorite (Melt Breccia)
SEE OFFICIAL METEORITICAL SOCIETY ENTRY BELOW:
Northwest Africa 13757
Basic information
Name:
Northwest Africa 13757
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 13757
Observed fall:
No
Year found:
2020
Country:
Algeria
Mass:
16.97 kg
Classification
history:
Recommended:
Lunar (melt breccia)
This is 1 of 10 approved meteorites classified as Lunar (melt breccia).
Search for other: Lunar meteorites
Comments:
Approved 25 Apr 2021
Writeup
Writeup from MB 110:
Northwest Africa
13757
(NWA
13757
)
Algeria
Purchased: 2020 Dec
Classification: Lunar meteorite (melt breccia)
History
: Numerous stones (purportedly found at the same unspecified site in Algeria which produced NWA 13676) were purchased by Darryl Pitt in December 2020 from a dealer in Zagora, Morocco.
Physical characteristics
: All of the stones (total weight 16974 g) are dark gray and relatively fine grained with an exterior shiny patina.
Petrography
: (A. Irving,
UWS
and P. Carpenter,
WUSL
) Breccia composed of mineral clasts of anorthite, olivine, low-Ca pyroxene, pigeonite and augite plus mafic lithic clasts in a very fine grained matrix containing partially altered kamacite, both high-Ti and low-Ti chromite, and minor secondary barite and celestite. These specimens are richer in mafic components by comparison with typical feldspathic lunar breccias. Mafic lithic clasts include microgabbro, subophitic olivine-bearing mare basalt and quench-textured basalt lithologies. The matrix exhibits some fluidal alignment of elongate mineral clasts and is sparsely microvesicular.
Geochemistry
: Olivine (Fa
26.2-41.1
, FeO/MnO = 81-92, N = 5), low-Ca pyroxene (Fs
27.8
Wo
4.4
, FeO/MnO = 60), pigeonite (Fs
23.9-35.9
Wo
13.5-18.6
, FeO/MnO = 43-52, N = 3), subcalcic augite (Fs
43.6
Wo
32.4
, FeO/MnO = 51), augite (Fs
11.0
Wo
38.4
, FeO/MnO = 41), anorthite (An
93.8-96.6
Or
0.4-0.1
, N = 3).
Classification
: Lunar (melt breccia). This material has textural, petrologic and mineral chemical features consistent with being paired to the stone classified as NWA 13676, and was procured from the same Algerian source.
Specimens
: 20.85 g in the form of a polished endcut at
UWB
; remainder with
DPitt
.
Data from:
MB110
Table 0
Line 0:
Place of purchase:
Zagora
Date:
P 2020 Dec
Mass (g):
16974
Pieces:
many
Class:
Lunar (melt breccia)
Shock stage:
high
Weathering grade:
low
Fayalite (mol%):
26.2-41.1
Ferrosilite (mol%):
27.8; 23.9-35.9; 43.6; 11.0
Wollastonite (mol%):
4.4; 13.5-18.6; 32.4; 38.4
Classifier:
A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):
20.85
Type spec location:
UWB
Main mass:
D. Pitt/S. Yousfi/A. Habibi
Finder:
anonymous
Comments:
Work names MVCH 601; submitted by A. Irving
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