UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Irregular
Perfect on {110} at 56° and 124°; partings on {010} and {100}
{100} imperfect, {110} indistinct; partings on {111} or {011}
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references