Colorless, Yellow, Blue, Reddish, Black, Reddish, Brown, Blue, gray, Black, Reddish, Brown, Blue, gray
Colorless, Yellow, Brown, Green, Colorless, Green, Yellow, Red, Reddish, Brown
Subconchoidal, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Brittle, Metallic, Brittle, Metallic
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Ca(Mg,Al)3(Al3Si)O10(OH)2