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