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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.
1.4. Almost 85% of the atoms in the crust are oxygen or silicon atoms, and as a result the vast majority of common (rock-forming) minerals are silicates -- combinations of oxygen and silicon primarily with the other six (most common) metals listed above.Pure silica or quartz consists of only silicon and oxygen.Also see Meteorites). Most of the common rock-forming minerals are combinations of the most abundant materials in the Earth, taking into account the differentiation of the Earth into lighter and denser layers early in its history.