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