Properties of Gritstone lan Nephelinite
ukuran gandum
coarse grained
grained nggoleki
porosity
Highly keropos
kurang keropos
luster
kurang
vitreous kanggo metallic
kateguhan
ora kasedhiya
2.7
tartamtu gravitasi
2.250
2.4-2.9
Kapadhetan
2.2 g / cm 3
2.5-3 g / cm 3
resistance
tahan panas, impact tahan, meksa tahan
tahan panas