Properties of Batubara lan Trachyte
ukuran gandum
medium kanggo nggoleki coarse grained
grained nggoleki
porosity
kurang keropos
kurang keropos
luster
kurang kanggo vitreous kanggo submetallic
metallic
tartamtu gravitasi
1.1-1.4
2.7
Kapadhetan
1100-1400 g / cm 3
2.43-2.45 g / cm 3
resistance
tahan panas
tahan panas, impact tahan, nyandhang tahan