Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
Greenish, White, White, gray, Greenish, Reddish, White, gray, Greenish, Green, gray, White, gray, Greenish, Green, gray
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Perfect on {001}, very good on {010}, imperfect on {110}
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)