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There are many different chemicals that make up rocks, and these chemicals are made up of a number of different elements. The most usual elements found in rocks include oxygen, iron, aluminum, silicon, calcium, potassium, sodium, sulphur, nitrogen. In various combinations these form a variety of compounds.

Rock is composed of a mineral, or most often, of a combination of minerals. Minerals are inorganic, naturally occurring solids, with a crystalline structure and a fairly definite chemical formula. Examples of minerals would include quartz, pyrite, hematite, magnetite, mica, diamond, corundum, calcite, feldspar, and thousands of others.

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15y ago

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