White, Colorless, Blue, Red, Green, Yellow, Violet, pink
Colorless, White, Yellow, Green, White, pink, Green, Yellow, Violet, White, pink, Green, Yellow, Violet
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Uneven, Brittle, Uneven, Brittle, Uneven
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.
(K,Na)Ca4Si8O20(F,OH)•8(H2O)