White, Blue, Yellow, Brown, Green, Brownish, Greenish, gray
Green, Black, White, Grey, Green, Black, White, Grey, Green, Black, gray, Black, Green, Black, gray, Black
Gemstones (2009), Flexible Flexible fragments.
Uneven, UnevenArthur Thomas, Gemstones (2009), Splintery
Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 2(Mg,Fe) 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.