Colorless, Yellow, Blue, Reddish, Black, Reddish, Brown, Blue, gray, Black, Reddish, Brown, Blue, gray
Colorless, White, Yellow, Green, White, pink, Green, Yellow, Violet, White, pink, Green, Yellow, Violet
Subconchoidal, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Brittle, Uneven, Brittle, Uneven
Perfect on [001] and [011]
Perfect on {001}, imperfect on {110}
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
(K,Na)Ca4Si8O20(F,OH)•8(H2O)