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Gold is a chemical element (Au symbol) of atomic number 79 ...
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Manganese (a designation deprecated by its similarity to magnesium) is a ...
Platinum is a chemical element of symbol Pt and atomic number ...
Copper is a chemical element of symbol Cu atomic number 29 ...
Nickel is a chemical element of symbol Ni of atomic number ...
Iron Ores are rocks from which metallic iron can be obtained ...
Mineral coal is a combustible sedimentary rock, black or brown in ...