Uneven, UnevenArthur Thomas, Gemstones (2009), Splintery
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Irregular
Ca 2(Mg,Fe) 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references