Uneven, Brittle, Metallic
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
CuFeS 2Anthony et al , Handbook of mineralogy (2001)
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references