igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica/hornblende
AI-generated identification · may be incorrectTypically gray with interlocking white feldspar, translucent-gray quartz, and dark biotite or hornblende; Mohs hardness about 6–7, vitreous to dull luster, no cleavage as a rock, and density about 2.6–2.8 g/cm³.
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Physical properties
Typically gray with interlocking white feldspar, translucent-gray quartz, and dark biotite or hornblende; Mohs hardness about 6–7, vitreous to dull luster, no cleavage as a rock, and density about 2.6–2.8 g/cm³.
Formation & geological history
Magma cooled slowly deep underground, allowing visible crystals to form; most granite formed during Precambrian to Phanerozoic continental mountain-building events, generally millions to billions of years ago.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and building cladding; attractive polished pieces are also collected.
Geological facts
The specimen’s speckled, interlocking texture is characteristic of granite, though its exact variety cannot be confirmed from one photograph.
Field identification & locations
Identify it by visible quartz and feldspar crystals with dark mica or amphibole and by its hard, massive texture; common worldwide in continental shields, mountain belts, and granite quarries.
