Apophyllite
Chemical Formula	(K,Na)Ca4Si8O20(F,OH) ? 8H2O
Species	Silicates
Mohs Scale	4-5
Specific Gravity	2.3-2.4
Color	Usually white, colorless; also blue, green, brown, yellow, pink, Purple
Streak	White
Luster	Vitreous, Pearly
Refractive Index	n = 1.535 n = 1.537
Diaphaneity	Transparent to translucent
Cleavage	Perfect
Fracture	Uneven
Crystal Habit：prismatic, tabular, massive