Properties of Obsidian lan Ganister
ukuran gandum
ora ditrapake
coarse utawa nggoleki
rengat
conchoidal
splintery
porosity
banget kurang keropos
Highly keropos
cleavage
non-ana
sampurna
kateguhan
ora kasedhiya
2.6
tartamtu gravitasi
2.6-2.7
2.2-2.8
Kapadhetan
2.6 g / cm 3
2.2-2.8 g / cm 3
resistance
tahan panas, impact tahan
tahan panas, impact tahan, meksa tahan