White, Colorless, Blue, Red, Green, Yellow, Violet
Green, Black, White, Grey, Green, Black, White, Grey, Green, Black, gray, Black, Green, Black, gray, Black
Not Available
Uneven, UnevenArthur Thomas, Gemstones (2009), Splintery
Transparent, Opaque, Transparent to opaque
TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references