Properties of Obsidian lan Granulite
ukuran gandum
ora ditrapake
medium kanggo coarse grained
rengat
conchoidal
ora kasedhiya
porosity
banget kurang keropos
banget kurang keropos
kateguhan
ora kasedhiya
ora kasedhiya
tartamtu gravitasi
2.6-2.7
2.8-3.0
Kapadhetan
2.6 g / cm 3
3.06-3.33 g / cm 3
resistance
tahan panas, impact tahan
tahan panas, nyandhang tahan