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granite a coarse-grained igneous rock usu. composed of silica-rich minerals such as quartz, feldspar, and small amounts of mica or amphibole, commonly used for building, sculpture, and the like. [1/2 definitions]
hornblende a variety of amphibole that is greenish to black in color, common in metamorphic rocks and dark igneous rocks that are rich in iron and magnesium.