Colorless, Yellow, Blue, Reddish, Black, Reddish, Brown, Blue, gray, Black, Reddish, Brown, Blue, gray
White, Blue, Yellow, Brown, Green, Brownish, Greenish, gray
Subconchoidal, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Gemstones (2009), Flexible Flexible fragments.
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references