Properties of Batubara lan Hornfels
ukuran gandum
medium kanggo nggoleki coarse grained
grained nggoleki
rengat
conchoidal
conchoidal
porosity
kurang keropos
Highly keropos
luster
kurang kanggo vitreous kanggo submetallic
mengilap
kekuatan compressive
ora Sumadhiya
cleavage
non-ana
sampurna
kateguhan
ora kasedhiya
durung ketemu
tartamtu gravitasi
1.1-1.4
3.4-3.9
Kapadhetan
1100-1400 g / cm 3
0.25-0.30 g / cm 3
resistance
tahan panas
tahan panas, impact tahan, meksa tahan