Southern and central Africa
Not Available, Southern and central Africa
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
SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)
Ca 2(Mg,Fe) 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.