Uneven, Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven, Subconchoidal, Brittle, Metallic, Brittle, Metallic
Uneven, Sub-Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)
ZnCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references