ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.
(Mg,Fe) 5(SiO 4) 2(F,OH) 2Ulrich Henn and Claudio C.