igneous
Weathered granite or granitic building stone
Granite; chiefly quartz, alkali feldspar, plagioclase, and minor biotite/hornblende
AI-generated identification · may be incorrectCoarse, massive, irregularly fractured rock with pinkish-gray to brown weathered surfaces and faint granular texture; typical hardness is about 6–7 Mohs, vitreous to dull luster, no cleavage as a whole, and density about 2.6–2.7 g/cm³.…
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Physical properties
Coarse, massive, irregularly fractured rock with pinkish-gray to brown weathered surfaces and faint granular texture; typical hardness is about 6–7 Mohs, vitreous to dull luster, no cleavage as a whole, and density about 2.6–2.7 g/cm³. The photograph is not detailed enough to confirm mineral grains or distinguish granite from related granitic rocks.
Formation & geological history
Intrusive igneous rock crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to Mesozoic continental events; surface weathering produces the brown coatings and rounded fractures visible here.
Uses & applications
Used extensively as crushed aggregate, road base, riprap, foundations, curbs, paving, countertops, and monuments; attractive pieces may be collected but these appear construction-grade fragments.
Geological facts
Granite commonly develops blocky jointing and chemically weathers to sandy grus. Pink coloration usually reflects potassium feldspar, while dark specks may be biotite or amphibole.
Field identification & locations
Look for interlocking visible quartz and feldspar grains, abundant feldspar, and a hard, nonporous surface; a streak test is usually white. Common worldwide in continental shields, mountain batholiths, and quarry spoil.
