UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, Brittle, Metallic
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
CoAsSAnthony et al , Handbook of mineralogy (2001)
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.