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Check the listing for details. granite - teaching hand/display specimen of typical granite. Listed at 10.45 USD. Granite is an intrusive igneous rock composed primarily of feldspar, quartz and mica. The mica in this granite is biotite. During the Cretaceous it intruded the Jurassic granodiorite of the Sierra Nevada batholith and forms a light colored mass on its eastern slope at Sand Canyon in Kern County, California.