igneous
Weathered granitic rock fragment
Granite, chiefly quartz, feldspar, and mica (approx. SiO₂-rich silicate assemblage)
AI-generated identification · may be incorrectCoarse-grained, speckled gray, white, and brown appearance with vitreous quartz and feldspar-rich grains; typical hardness is about 6–7 Mohs, with no dominant cleavage as a whole and a granular crystal texture.
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Physical properties
Coarse-grained, speckled gray, white, and brown appearance with vitreous quartz and feldspar-rich grains; typical hardness is about 6–7 Mohs, with no dominant cleavage as a whole and a granular crystal texture.
Formation & geological history
Forms when silica-rich magma slowly crystallizes deep within continental crust, commonly during Precambrian to Phanerozoic mountain-building events; the fragment appears naturally weathered or broken.
Uses & applications
Used widely as building stone, paving, countertops, monuments, and aggregate; small unexceptional fragments have negligible commercial value.
Geological facts
Granite is an intrusive igneous rock whose visible crystals indicate slow cooling. Brown coloration may reflect iron-oxide weathering of biotite or feldspar.
Field identification & locations
Identify it by interlocking visible grains of quartz, feldspar, and dark mica, unlike uniformly fine-grained basalt; common worldwide in continental shields, mountain belts, and gravel deposits.
