igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and dark mica or amphibole
AI-generated identification · may be incorrectPale gray-white with scattered black minerals; interlocking visible crystals, usually vitreous quartz and feldspar with dark specks. Typical hardness is about 6–7 Mohs; no regular cleavage as a whole rock. The rounded shape appears naturally weathered or water-worn.
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Physical properties
Pale gray-white with scattered black minerals; interlocking visible crystals, usually vitreous quartz and feldspar with dark specks. Typical hardness is about 6–7 Mohs; no regular cleavage as a whole rock. The rounded shape appears naturally weathered or water-worn.
Formation & geological history
Forms when silica-rich magma cools slowly beneath the surface, allowing large crystals to grow. Granite bodies occur across many geological ages, from Archean shields to younger mountain belts.
Uses & applications
Widely used for building stone, paving, countertops, monuments, and crushed aggregate; attractive specimens are also collected.
Geological facts
The black-and-white speckled appearance reflects contrasting light feldspar/quartz and dark biotite or hornblende. The image is consistent with granite, though mineral identification from a photo is limited.
Field identification & locations
Look for coarse, interlocking light crystals and scattered dark grains, with no layering; common in continental crust and exposed mountain ranges worldwide. A rounded form may indicate stream or shoreline abrasion.
