UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), (e.g. graphite).
Perfect on {110} at 56° and 124°; partings on {010} and {100}
{110} Distinct, {001} Indistinct, {100} Indistinct
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
PbCrO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references