Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
Green, Blue, Yellow, White
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Not Available
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Mg 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)