White, Colorless, Blue, Red, Green, Yellow, Violet, pink
Yellow, Brownish, Reddish, Green, Brownish, Yellow, Green, Yellow, Red
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Uneven
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.
(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)