|from The Meteoritical Bulletin, No. 109 |
Northwest Africa 13582 (NWA 13582)
Classification: Lunar meteorite (feldspathic breccia)
History: Purchased by Bo Zhang in Jun. 2019 from an anonymous dealer.
Physical characteristics: Small vesicles are visible in the hand specimen.
Petrography: Lithic clasts and mineral fragments (0.01 to 2 mm) set in an anorthositic matrix. Lithic clasts include anorthositic, gabbroic, noritic and impact melted clasts. Mineral fragments are dominated by pyroxene and minor olivine. Plagiocalse is highly Ca-rich (K2O < 0.025 wt%) while a few clasts contain relatively K-rich plagiocalse (K2O = 0.23-0.45 wt%). Some pyroxene grains exhibit exsolved lamella. Vesicles are common. Other accessory minerals include ilmenite, troilite and FeNi metal.
Geochemistry: Plagioclase (An95.5-99.3Or0-0.2, n=14; An85.0-90.7Or1.6-3.5, n=3), olivine (Fa19.6-34.9, FeO/MnO=83.3-98.2, n=7), low-Ca pyroxene (Fs16.5-47.8Wo2.4-13.2, FeO/MnO=48.2-62.7, n=11), Ca-rich pyroxene (Fs8.8-52.8Wo27.2-44.3, FeO/MnO=43.6-73.4, n=11).
Specimens: 20 g at PMO. Mr. Bo Zhang holds the main mass.
I have not studied 13582. It might be another NWA 8046 pair.
More InformationMeteoritical Bulletin Database NWA 13582