Red, Blue, Green, Brown, Black
Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references