What are minerals ?
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About 99 percent of the minerals in the Earth's crust are made up of eight elements, including oxygen, silicon, copper, iron, calcium, sodium, potassium and magnesium.
Minerals are substances that are naturally present in the earth and are not formed from animal or vegetable matter. ... Minerals are generally classified as metallic and non-metallic minerals. Metallic minerals include iron ore, uranium, bauxite, manganese, gold, silver and copper.
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