Properties of Batubara lan Slate
ukuran gandum
medium kanggo nggoleki coarse grained
banget nggoleki-grained
rengat
conchoidal
splintery
tilas
ireng
cahya kanggo coklat peteng
porosity
kurang keropos
kurang keropos
luster
kurang kanggo vitreous kanggo submetallic
kurang
tartamtu gravitasi
1.1-1.4
2.65-2.8
Kapadhetan
1100-1400 g / cm 3
2.6-2.8 g / cm 3
resistance
tahan panas
tahan panas, impact tahan, meksa tahan, nyandhang tahan