Properties of Variolite lan Tephrite
ukuran gandum
ora ditrapake
medium kanggo nggoleki coarse grained
rengat
conchoidal
ora rata
tilas
putih kanggo werna abu-abu
bluish ireng
porosity
kurang keropos
banget kurang keropos
luster
ora kasedhiya
subvitreous kanggo kurang
cleavage
ora kasedhiya
crenulation lan mrembet
tartamtu gravitasi
2.8-3
2.86
Kapadhetan
2.9-3.1 g / cm 3
2.8-2.9 g / cm 3
resistance
tahan panas, meksa tahan, nyandhang tahan
tahan panas, impact tahan