Properties of Pumice lan Batubara
ukuran gandum
grained nggoleki
medium kanggo nggoleki coarse grained
tilas
putih, greenish putih utawa abu-abu
ireng
porosity
Highly keropos
kurang keropos
luster
earthy
kurang kanggo vitreous kanggo submetallic
kekuatan compressive
ora Sumadhiya
cleavage
sampurna
non-ana
kateguhan
3
ora kasedhiya
tartamtu gravitasi
2.86
1.1-1.4
Kapadhetan
0.25-0.3 g / cm 3
1100-1400 g / cm 3
resistance
impact tahan, meksa tahan
tahan panas