Brown, Black
Yellow, Greenish, Brownish, Colorless, White, gray, Yellow, Green, Blue, Violet, Blue, Colorless, Green, gray, Yellow, Blue, Colorless, Green, gray, Yellow, orange
Not Available
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
CaSO 4 · 2H 2OWalter Schumann , Gemstones of the world (2001)
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references