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