Blue, White, Grey, Yellow, Green, Colorless, Red, gray
Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
Uneven, Conchoidal, Brittle
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
(Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references