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