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