ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, Brittle, Metallic
Ca 5(F,Cl)(PO 4) 3Arthur Thomas , Gemstones (2009)
CoAsSAnthony et al , Handbook of mineralogy (2001)