Stilbite
Chemical Formula	Stilbite-Ca: NaCa4(Si27Al9)O72·28(H2O)Stilbite-Na: Na9(Si27Al9)O72·28(H2O)
Species	Silicates
Mohs Scale	3-4
Specific Gravity	2.12-2.22
Color	Usually colorless, white or pink
Streak	White
Luster	Vitreous, Pearly
Refractive Index	n = 1.479 - 1.492 n = 1.485 - 1.500 n = 1.489 - 1.505
Diaphaneity	Transparent to translucent
Cleavage	Perfect on
Fracture	Conchoidal or uneven
Crystal Habit：Thin tabular, aggregates sheaf-like or in bow-ties, also fibrous and globular.