Properties of Obsidian lan Pumice
ukuran gandum
ora ditrapake
grained nggoleki
tilas
putih
putih, greenish putih utawa abu-abu
porosity
banget kurang keropos
Highly keropos
cleavage
non-ana
sampurna
kateguhan
ora kasedhiya
3
tartamtu gravitasi
2.6-2.7
2.86
Kapadhetan
2.6 g / cm 3
0.25-0.3 g / cm 3
resistance
tahan panas, impact tahan
impact tahan, meksa tahan