ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Uneven, ConchoidalArthur Thomas, Brittle, Metallic
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.
Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)