Properties of Argillite lan Anthracite
ukuran gandum
grained nggoleki
medium kanggo nggoleki coarse grained
rengat
conchoidal kanggo ora rata
conchoidal
tilas
putih kanggo werna abu-abu
ireng
porosity
Highly keropos
kurang keropos
luster
waxy lan kurang
mengilap
kateguhan
2.6
ora kasedhiya
tartamtu gravitasi
2.56-2.68
1.1-1.4
Kapadhetan
2.54-2.66 g / cm 3
1.25-2.5 g / cm 3
resistance
tahan panas, impact tahan
tahan panas, banyu tahan