Properties of Skarn lan Anthracite
ukuran gandum
grained nggoleki
medium kanggo nggoleki coarse grained
rengat
ora duwe aturan baku
conchoidal
tilas
cahya kanggo coklat peteng
ireng
porosity
kurang keropos
kurang keropos
luster
waxy lan kurang
mengilap
kateguhan
2.4
ora kasedhiya
tartamtu gravitasi
2.86
1.1-1.4
Kapadhetan
2.8-2.9 g / cm 3
1.25-2.5 g / cm 3
resistance
tahan panas
tahan panas, banyu tahan