Uneven, ConchoidalArthur Thomas, Brittle, Metallic
UnevenAnthony et al, Handbook of mineralogy (2001), UnevenAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)
CaMoO 4Michael OâDonoghue , Gems, Sixth Edition (2006)