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The six minerals olivine, quartz, feldspar, mica, pyroxene and amphibole are the commonest rock-forming minerals and are used as important tools in classifying rocks, particularly igneous rocks. Except for quartz, all the minerals listed are actually mineral groups.
it must be a crystalline solid; it must have a consistent chemical composition. The 20 most common minerals are called rock-forming minerals because they form the rocks that make up Earthâs crust. Ten minerals are so common that they make up 90% of Earthâs crust.