igneous
Weathered granitic rock
Granite to granodiorite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectCoarse-grained, speckled pink, gray, white, and dark minerals with a massive texture; likely Mohs 6–7, vitreous quartz and dull feldspar, with no obvious cleavage at specimen scale. The dark rounded patches may be biotite-rich areas, weathering, or inclusions.
Identified More igneous →
Explore Weathered granitic rock in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse-grained, speckled pink, gray, white, and dark minerals with a massive texture; likely Mohs 6–7, vitreous quartz and dull feldspar, with no obvious cleavage at specimen scale. The dark rounded patches may be biotite-rich areas, weathering, or inclusions.
Formation & geological history
Formed when silica-rich magma crystallized slowly deep underground, probably during Precambrian to Mesozoic continental crust formation; later uplift and weathering exposed it at the surface.
Uses & applications
Commonly used as crushed aggregate, dimension stone, countertops, monuments, and building facing; this weathered fragment has little jewelry value.
Geological facts
Granite is primarily quartz, potassium feldspar, plagioclase, and mica, although the exact mineral proportions cannot be confirmed from the photograph alone.
Field identification & locations
Identify it by visible interlocking crystals, pink/white feldspar, translucent-gray quartz, and black mica. Common worldwide, especially in continental mountain belts; a fresh broken surface and streak-free hardness testing improve identification.
