These alloying ingredients include chromium, molybdenum, silicon, manganese, nickel and vanadium. Other important nutrients include phosphorus, sulfur, calcium, potassium, magnesium and manganese. Bromine radicals decompose cobalt and manganese hydroperoxides. The area produced copper, silver, zinc, iron and manganese. Typical catalysts include cobalt or manganese naphthenates. Depletion of zinc and accumulation of manganese may play a role. It was also rich in asbestos, granite, vanadium, chromium and manganese. These can also include small amounts of boron, magnesium, aluminum, silicon, titanium, manganese, and iron. Mineral resources include nickel, copper, manganese, and chromite. Iron, bauxite, manganese, clays, limestone, and silica are mined. These include copper, phosphates, bromide, potash, clay, sand, sulfur, asphalt, and manganese. Tahini is a source of calcium, manganese, potassium, and phosphorus. South Africa is a major exporter of manganese as well as chromium. Manganese and iron oxides were used in rock paintings. Other major mineral reserves include those of coal, coalbed methane, manganese and dolomite.