NWA 13937 (6,217g)

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
    404,00 €Preis
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