Properties of Anthracite lan Porphyry
ukuran gandum
medium kanggo nggoleki coarse grained
grained nggoleki
rengat
conchoidal
ora duwe aturan baku
porosity
kurang keropos
kurang keropos
kateguhan
ora kasedhiya
1.7
tartamtu gravitasi
1.1-1.4
2.5-4
transparan
opaque
tembus kanggo opaque
Kapadhetan
1.25-2.5 g / cm 3
2.5-2.52 g / cm 3
kapasitas panas tartamtu
ora Sumadhiya
resistance
tahan panas, banyu tahan
tahan panas, impact tahan