Colorless, Yellow, Blue, Reddish, Black, Reddish, Brown, Blue, gray, Black, Reddish, Brown, Blue, gray
Colorless, White, Yellow, White, Greenish, gray, Brown, Colorless, Yellow
Subconchoidal, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, Brittle, Conchoidal
Perfect on [001] and [011]
{010} perfect, {110} distinct, {100} in traces
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references