Uneven, Sub-Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, Brittle, Metallic
ZnCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CoAsSAnthony et al , Handbook of mineralogy (2001)