Granitic rock, likely weathered granite

Coarse-grained, speckled gray-white rock with visible glassy quartz and dark mica; hardness about 6–7 Mohs, nonmetallic luster, interlocking crystals, and no obvious cleavage as a whole rock.

Forms when silica-rich magma cools slowly deep underground, producing large crystals; most granite is Precambrian to Mesozoic in age, depending on locality.

Widely used as dimension stone, countertops, monuments, aggregate, and building material; ordinary hand specimens have little commercial value.

The texture is phaneritic, meaning individual crystals formed slowly enough to be visible without magnification.

Identify it by its coarse interlocking grains and roughly equal mixture of light quartz/feldspar with dark biotite or hornblende. Common worldwide in continental crust, especially mountain belts; the photograph is insufficient to distinguish granite from granodiorite or quartz diorite confidently.