Mexico
Italy, India, USA, Canada
Colorless, Blue, Violet, White, Brown, Colorless, Blue, Violet, White, rose, Brown, gray, Colorless, White, Violet, gray, Colorless, White, Violet, gray
White, Colorless, Green, Yellow, Brown, Brown, Colorless, Yellow, White, Green
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Brittle, Uneven, Brittle, Uneven
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
NaCa16Si23AlO60(OH)8•64(H2O)