Properties of Gossan lan Obsidian
ukuran gandum
nggoleki grained medium
ora ditrapake
rengat
conchoidal
conchoidal
tilas
putih kanggo werna abu-abu
putih
porosity
Highly keropos
banget kurang keropos
kekuatan compressive
ora Sumadhiya
cleavage
ora kasedhiya
non-ana
kateguhan
ora kasedhiya
ora kasedhiya
tartamtu gravitasi
2.0
2.6-2.7
Kapadhetan
ora Sumadhiya
2.6 g / cm 3
resistance
tahan panas, impact tahan, meksa tahan
tahan panas, impact tahan