Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Brittle, Uneven, Brittle, Uneven
Perfect on [10 1 1] three directions with angle of 74° 55
Perfect on {001}, imperfect on {110}
CaCO 3Ulrich Henn and Claudio C.
(K,Na)Ca4Si8O20(F,OH)•8(H2O)