Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
Colorless, White, Yellow, White, Greenish, gray, Brown, Colorless, Yellow
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Conchoidal, Brittle, Conchoidal
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
{010} perfect, {110} distinct, {100} in traces
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references