igneous
Weathered granite
Granite; quartz–feldspar–biotite aggregate
AI-generated identification · may be incorrectCoarse-grained, phaneritic texture with pale pink/white feldspar, gray quartz, and black biotite or amphibole. Hardness is approximately 6–7 Mohs; nonfoliated, massive, with poor cleavage as a whole and specific gravity around 2.6–2.7.
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Physical properties
Coarse-grained, phaneritic texture with pale pink/white feldspar, gray quartz, and black biotite or amphibole. Hardness is approximately 6–7 Mohs; nonfoliated, massive, with poor cleavage as a whole and specific gravity around 2.6–2.7.
Formation & geological history
A felsic intrusive igneous rock crystallized slowly from silica-rich magma deep in the continental crust, commonly during Precambrian to younger mountain-building events. The rounded surface and moss suggest prolonged weathering and transport or exposure.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and decorative landscaping rock; attractive pieces may be collected but are generally not gem material.
Geological facts
Its visible large crystals indicate slow underground cooling. Pink coloration typically reflects potassium feldspar, while dark flakes are commonly biotite mica or hornblende.
Field identification & locations
Identify it by interlocking visible crystals of quartz, feldspar, and dark mica, without layering or foliation; a glassy gray quartz component and pink feldspar are especially diagnostic. Common worldwide in continental shields, mountain belts, and granite plutons.
