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Olivine Pyroxene Andesite

Comprising an important group of rock-forming minerals, olivines are common components of magnesium-rich, silica-poor igneous rocks. Moreover, olivines are generally believed to be among the most profuse components of the upper mantle of the Earth and have also been found in many meteorites. The name of the mineral group refers to the characteristic green coloring of its constituents. Perhaps the best-known type of olivine is peridot, the birthstone of the month of August.

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