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