Epistilbite
Chemical Formula	CaAl2Si6O16·5H2O
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	4
Specific Gravity	2.22-2.28
Color	Colorless, white, pinkish, yellowish
Streak	white
Luster	Vitreous
Refractive Index	n = 1.502 n = 1.510 n = 1.512
Diaphaneity	Transparent, Translucent
Cleavage	PerfectPerfect on
Fracture	Irregular/Uneven
Crystal Habit：Crystals prismatic; spherulitic, sheaflike aggregates
Geological Setting：Cavities in basalts and gneisses