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