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