Colorless, White, Brownish, Reddish, Black, Brownish, Black, Colorless, gray, White, Reddish, Brown
Green, Black, White, Grey, Green, Black, White, Grey, Green, Black, gray, Black, Green, Black, gray, Black
Uneven
Uneven, UnevenArthur Thomas, Gemstones (2009), Splintery
Na 3AlF 6Ulrich Henn and Claudio C.
Ca 2(Mg,Fe) 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
Gemmological Tables (2004) More from other references
TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references