copper, zinc, and iron. There are two general classes of silver ore that occurred in many cases. 5. google_color_text = "000000"; Insoluble in water; soluble in nitric acid, sodium cyanide (NaCN), and potassium cyanide (KCN). from a metallic sheen to an earthy soot-like appearance. [14], Except where otherwise noted, data are given for materials in their. vertical fissures probably produced by normal faulting of the hanging wall. Ores. For ores where the most valuable element is silver, the silver is normally //-->,