Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Perfect on [10 1 1] three directions with angle of 74° 55
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
CaCO 3Ulrich Henn and Claudio C.
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references