NWA 13937 (6,217g)

Northwest Africa 13937 (NWA 13937)
(Northwest Africa)
Purchased: 2021 Mar
Classification: Lunar meteorite (feldspathic breccia)
History: The meteorite was purchased from a dealer in Algeria.
Physical characteristics: Eleven dark-grayish fragments without fusion crust.
Petrography: The meteorite displays a dark-grayish interior and is a feldspar-rich fragmental breccia predominantly composed of lithic and mineral clasts in partly shock melted and vesicular matrix. Lithic clasts are gabbroic and basaltic clasts up to 7 mm in size. Dominant minerals are olivine, low-Ca pyroxene, pigeonite, augite, and calcic plagioclase. Minor phases are ilmenite, Ti-bearing chromite, FeS, and kamacite. Some opx-chromite symplectites are present in olivine. The meteorite is highly shocked and plagioclase partly transformed into maskelynite.
Geochemistry: olivine: Fa23.7±3.4 (Fa18.8-28.0, n=12, FeO/MnO=84±10); low-Ca pyroxene: Fs22.5±0.2Wo4.4±0.2 (Fs22.2-22.8Wo4.0-4.6, n=6, FeO/MnO=48±3); pigeonite: Fs32.7±0.9Wo12.7±1.8 (Fs31.7-34.0Wo10.6-15.9, n=6, FeO/MnO=48±3); augite: Fs12.3±1.5Wo39.1±3.4 (Fs11.0-15.2Wo32.6-41.8, n=6, FeO/MnO=37±2); calcic plagioclase: An97.4±0.3 (An96.9-97.8, n=10)
 
Place of purchase:
Algeria
Date:
P 2021 Mar
Mass (g):
1000
Pieces:
11
Class:
Lunar (feldsp. breccia)
Shock stage:
high
Weathering grade:
low
Fayalite (mol%):
23.7
Ferrosilite (mol%):
22.5; 32.7; 12.3
Wollastonite (mol%):
4.4; 12.7; 39.1
Classifier:
A. Greshake, MNB
Type spec mass (g):
24.3
Type spec location:
MNB
Main mass:
Hanno Strufe and Ismaily Sidi Mohamed, Erfoud, Morocco
Comments:
Submitted by Ansgar Greshake