Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Perfect on [10 1 1] three directions with angle of 74° 55
From the Greek for luster, for its pearly luster on the cleavage.
CaCO 3Ulrich Henn and Claudio C.
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)