Colorless, Yellow, Blue, Reddish, Black, Reddish, Brown, Blue, gray, Black, Reddish, Brown, Blue, gray
White, Green, Blue, Yellow, Brownish, Red, Blue, gray, Yellow, White
Subconchoidal, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Irregular
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Mg(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)