igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica or amphibole
AI-generated identification · may be incorrectLight gray to pale tan with dark mineral flecks and a visibly granular texture; likely quartz (Mohs 7), feldspars (6), and dark biotite or amphibole (5–6). Its minerals are interlocking crystals with no dominant cleavage or layering; the rounded shape appears naturally weathered or water-worn.
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Physical properties
Light gray to pale tan with dark mineral flecks and a visibly granular texture; likely quartz (Mohs 7), feldspars (6), and dark biotite or amphibole (5–6). Its minerals are interlocking crystals with no dominant cleavage or layering; the rounded shape appears naturally weathered or water-worn.
Formation & geological history
Forms when silica-rich magma cools slowly underground, allowing large crystals to grow. Granite occurs in continental crust of many ages; this specimen’s age and exact source cannot be determined from the image.
Uses & applications
Commonly used for building stone, paving, countertops, monuments, and crushed aggregate; attractive specimens are collected or polished decoratively.
Geological facts
Granite’s contrasting light and dark grains reflect its mixed mineral composition. The pictured rock is an intrusive igneous rock, not a single mineral.
Field identification & locations
Look for coarse, interlocking grains of light quartz and feldspar mixed with dark mica or amphibole, without strong foliation. Granite is widespread in continental mountain belts and shield regions worldwide.
