Italy, India, USA, Canada
Switzerland
White, Colorless, Green, Yellow, Brown, Brown, Colorless, Yellow, White, Green
Colorless, Yellow, Blue, Reddish, Black, Reddish, Brown, Blue, gray, Black, Reddish, Brown, Blue, gray
Brittle, Uneven, Brittle, Uneven
Subconchoidal, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
NaCa16Si23AlO60(OH)8•64(H2O)
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references