Properties of Scoria lan Gneiss
ukuran gandum
grained nggoleki
medium kanggo coarse grained
rengat
conchoidal
ora duwe aturan baku
porosity
Highly keropos
banget kurang keropos
luster
subvitreous kanggo kurang
kurang
kekuatan compressive
ora Sumadhiya
tartamtu gravitasi
ora Sumadhiya
2.5-2.7
transparan
opaque
tembus kanggo opaque
Kapadhetan
ora Sumadhiya
2.6-2.9 g / cm 3
resistance
tahan panas, impact tahan, meksa tahan, nyandhang tahan
tahan panas, meksa tahan, ngeruk tahan, nyandhang tahan