igneous
Granite
Granite, a felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, gray, and speckled with a mostly dull to slightly glassy luster; constituent minerals have Mohs hardnesses of about 2–7. The image does not reveal enough detail to confirm the mineral grains or identify the specimen conclusively.
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Physical properties
Coarse-grained, gray, and speckled with a mostly dull to slightly glassy luster; constituent minerals have Mohs hardnesses of about 2–7. The image does not reveal enough detail to confirm the mineral grains or identify the specimen conclusively.
Formation & geological history
Granite forms when silica-rich magma cools slowly beneath the surface, allowing visible crystals to grow. Such rocks occur across many geological ages in continental crust.
Uses & applications
Commonly used as building and dimension stone, countertops, paving, monuments, and decorative stone.
Geological facts
Granite is a rock rather than a single mineral; its exact appearance and properties vary with mineral proportions and grain size.
Field identification & locations
The gray, mottled appearance is consistent with granite, but a close view of grains—especially quartz and feldspar—is needed to distinguish it from other dark, coarse-grained rocks. Granite is widespread in continental mountain belts and exposed plutons.
