igneous
Granite
Granite, composed chiefly of quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse-grained, mottled gray, cream, and black; vitreous quartz and feldspar with dark biotite or hornblende. Hardness is about 6–7 Mohs, with no strong cleavage as a whole and a granular crystalline texture.
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Physical properties
Coarse-grained, mottled gray, cream, and black; vitreous quartz and feldspar with dark biotite or hornblende. Hardness is about 6–7 Mohs, with no strong cleavage as a whole and a granular crystalline texture.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events.
Uses & applications
Widely used as dimension stone, countertops, monuments, aggregate, and building facades; this small piece has mainly educational or modest collecting value.
Geological facts
The image shows a rounded, weathered specimen with granitic texture, though exact identification would benefit from a fresh surface or thin section. Darker varieties may grade toward granodiorite or quartz diorite.
Field identification & locations
Identify it by visible interlocking grains, abundant pale feldspar, glassy gray quartz, and black mica or amphibole; it commonly occurs in continental plutons, glacial deposits, and stream gravels worldwide.
