Demandite is the word used by mineral economists to describe the materials that must be provided usually by mining to meet the needs of civilization.
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Zinc is a chemical element with symbol Zn and atomic number 30. It is the first element in group 12 of the periodic table.In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn 2+ and Mg 2+ ions are of similar size.
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