Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
Colorless, Yellow, Brown, Green, Colorless, Green, Yellow, Red, Reddish, Brown
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Brittle, Metallic, Brittle, Metallic
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Ca(Mg,Al)3(Al3Si)O10(OH)2