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