Properties of Batubara lan Comendite
ukuran gandum
medium kanggo nggoleki coarse grained
grained medium
rengat
conchoidal
mrembet
porosity
kurang keropos
Highly keropos
luster
kurang kanggo vitreous kanggo submetallic
kurang
tartamtu gravitasi
1.1-1.4
2.38
Kapadhetan
1100-1400 g / cm 3
-9999 g / cm 3
resistance
tahan panas
tahan panas, impact tahan