Brown, Yellow, White, Brown, Greenish, Yellow, White
Colorless, Yellow, Blue, Reddish, Black, Reddish, Brown, Blue, gray, Black, Reddish, Brown, Blue, gray
Uneven, Even, Yellow, White
Subconchoidal, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
K(Mg,Fe++)3[AlSi3O10(OH,F)2
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references