Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Metallic
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)