White, Colorless, Blue, Red, Green, Yellow, Violet
Colorless, White, Yellow, Green, White, pink, Green, Yellow, Violet, White, pink, Green, Yellow, Violet
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Brittle, Uneven, Brittle, Uneven
SiO 2 + H 2OUlrich Henn and Claudio C.
(K,Na)Ca4Si8O20(F,OH)•8(H2O)