Green, Green, Yellow, Brown, White, gray, Black
Yellow, Brownish, Reddish, Green, Brownish, Yellow, Green, Yellow, Red
Splintery, Granular, Splintery, Granular, Gemstones (2009)
Uneven
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)