Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
White, Green, Blue, Yellow, Brownish, Red, Blue, gray, Yellow, White
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Irregular
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Mg(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)