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