Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
CaCO 3Ulrich Henn and Claudio C.
Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)