Properties of Slate lan Obsidian
ukuran gandum
banget nggoleki-grained
ora ditrapake
rengat
splintery
conchoidal
tilas
cahya kanggo coklat peteng
putih
porosity
kurang keropos
banget kurang keropos
kateguhan
1.2
ora kasedhiya
tartamtu gravitasi
2.65-2.8
2.6-2.7
Kapadhetan
2.6-2.8 g / cm 3
2.6 g / cm 3
resistance
tahan panas, impact tahan, meksa tahan, nyandhang tahan
tahan panas, impact tahan