igneous
Granite-like igneous rock
Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectGray, speckled, massive rock with granular texture and faint mica sparkle; likely Mohs 6–7, vitreous-to-dull luster, interlocking crystals, and no obvious cleavage as a whole rock. Exact identification is limited by the photograph.
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Physical properties
Gray, speckled, massive rock with granular texture and faint mica sparkle; likely Mohs 6–7, vitreous-to-dull luster, interlocking crystals, and no obvious cleavage as a whole rock. Exact identification is limited by the photograph.
Formation & geological history
Formed when silica-rich magma cooled slowly deep in the continental crust, producing visible interlocking crystals; commonly Precambrian to Phanerozoic in age depending on locality.
Uses & applications
Used extensively as crushed stone, dimension stone, paving, monuments, countertops, and landscaping material; ordinary hand specimens have little commercial value.
Geological facts
Granite’s light minerals are chiefly quartz and feldspar, while dark flecks are commonly biotite or hornblende. Granodiorite is similar but contains more plagioclase than potassium feldspar.
Field identification & locations
Look for visible quartz grains, pale feldspar, and scattered dark mica/hornblende, with hardness sufficient to scratch glass. Common worldwide, especially in continental mountain belts; a streak, acid test, and fresh broken surface improve identification.
