Uneven, Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven, Subconchoidal, Brittle, Metallic, Brittle, Metallic
Uneven, ConchoidalArthur Thomas, Brittle, Metallic
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)
Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)