Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), (e.g. graphite).
Perfect on [10 1 1] three directions with angle of 74° 55
{110} Distinct, {001} Indistinct, {100} Indistinct
CaCO 3Ulrich Henn and Claudio C.
PbCrO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references