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Granite is an igneous rock that forms when magma cools slowly beneath the earth’s surface, forming large, easily visible crystals of quartz, feldspar, and mica. Scientifically, an intrusive (plutonic) igneous rock must contain between 10% and 50% quartz to be classified as granite, but other similar stones such as gabbro, diabase, anorthosite, sodalite, gneiss, and basalt are sometimes sold as “granite” commercially.A wide variety of granites exist on the market, both foreign and domestic, and these can be drastically different in density, hardness, porosity, and aesthetics.