Properties of Basalt lan Anthracite
ukuran gandum
grained nggoleki
medium kanggo nggoleki coarse grained
rengat
conchoidal
conchoidal
tilas
putih kanggo werna abu-abu
ireng
porosity
kurang keropos
kurang keropos
luster
ora kasedhiya
mengilap
kekuatan compressive
ora Sumadhiya
cleavage
ora kasedhiya
non-ana
kateguhan
2.3
ora kasedhiya
tartamtu gravitasi
2.8-3
1.1-1.4
Kapadhetan
2.9-3.1 g / cm 3
1.25-2.5 g / cm 3
resistance
tahan panas, meksa tahan, nyandhang tahan
tahan panas, banyu tahan