igneous
Weathered granite or granitic rock
Granite; interlocking quartz, feldspar, and mica grains
AI-generated identification · may be incorrectCoarse-grained, pinkish-gray to brown, granular texture with dark mica/amphibole spots; typically Mohs 6–7, vitreous to dull luster, no cleavage as a whole, and density about 2.6–2.8 g/cm³.
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Physical properties
Coarse-grained, pinkish-gray to brown, granular texture with dark mica/amphibole spots; typically Mohs 6–7, vitreous to dull luster, no cleavage as a whole, and density about 2.6–2.8 g/cm³.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, usually during Precambrian to Phanerozoic continental crust formation; surface weathering rounded the specimen.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and landscaping rock; this small weathered piece has mainly educational or modest collecting value.
Geological facts
Granite is an intrusive igneous rock and commonly displays visible crystals because of slow cooling. Dark grains are commonly biotite mica or hornblende, while pale grains are feldspar and quartz.
Field identification & locations
Identify it by its visible interlocking light and dark crystals, lack of layering, and inability to scratch it with a steel knife; quartz may scratch glass. Common worldwide in continental mountain belts and exposed shields.
