Читать книгу Introduction to Ore-Forming Processes - Laurence Robb - Страница 23

This is a large group of minerals in which bonding is both ionic and covalent in character. The sulfide group has the general formula A_MX_P, where X is typically S but can be As, Sb, Te, Bi, or Se, and A is one or more of the metals. The sulfosalts, which are less common than sulfides, have the general formula A_MB_NX_P, where A is usually Ag, Cu, or Pb, B is commonly As, Sb, or Bi, and X is S. The sulfide and sulfosalt minerals are generally opaque, dense, and have a metallic to sub‐metallic luster.