Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
White, Yellow, Blue, Green, Green, gray, Yellow
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Uneven, Gems
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
{001} Perfect, {010} Good
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
KAlSi 3O 8Arthur Thomas , Gemstones (2009)