Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
Black, Green, Black, Green, Black, Green, gray, Black, Green, gray
White
Not Available, Not Available, gray, Green
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Brittle, Metallic, Brittle, Metallic
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
NaNa2(Fe++4Fe+++)Si8O22(OH)2