| http://www.w3.org/ns/prov#value | - Typically, at least a portion of these minerals are in the from of aluminum oxide, iron oxides, titanium oxide, iron metal, silicon dioxide and carbon, trace elements such as manganese oxides, and the minerals have been obtained from natural sources, e.g., mining, or from synthetic sources such as the mixing of chemicals containing aluminum, iron, silicon, manganese, and titanium.
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