Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
Brown, Yellow, White, Brown, Greenish, Yellow, White
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Even, Yellow, White
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
K(Mg,Fe++)3[AlSi3O10(OH,F)2