White, Colorless, Blue, Red, Green, Yellow, Violet
Colorless, White, Yellow, Green, White, pink, Green, Yellow, Violet, White, pink, Green, Yellow, Violet
Conchoidal, Conchoidal, Gemstones of the world (2001)
Uneven, Brittle, Uneven, Brittle, Uneven
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
(K,Na)Ca4Si8O20(F,OH)•8(H2O)