Properties of Porphyry lan Greywacke
ukuran gandum
grained nggoleki
sudut lan nggoleki
rengat
ora duwe aturan baku
conchoidal
porosity
kurang keropos
Highly keropos
tartamtu gravitasi
2.5-4
2.2-2.8
transparan
tembus kanggo opaque
opaque
Kapadhetan
2.5-2.52 g / cm 3
2.6-2.61 g / cm 3
resistance
tahan panas, impact tahan
tahan panas, impact tahan, meksa tahan