Yellow, Brownish, Reddish, Green, Brownish, Yellow, Green, Yellow, Red
Green, Black, White, Grey, Green, Black, White, Grey, Green, Black, gray, Black, Green, Black, gray, Black
Uneven
Uneven, UnevenArthur Thomas, Gemstones (2009), Splintery
(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)
Ca 2(Mg,Fe) 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.