NWA 13937 (4,982g)
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 |