White, Colorless, Blue, Red, Green, Yellow, Violet, pink
White, Pale pink, Colorless, pink, Yellow
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Not Available
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.
Mn2+ BO 2(OH)Anthony et al , Handbook of mineralogy (2001)