igneous
Weathered granite fragment
Granite, chiefly quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled pink-gray and brown, with vitreous quartz, feldspar, and dark mica; hardness about 6–7 Mohs, no consistent cleavage as a whole, specific gravity approximately 2.6–2.7.
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Physical properties
Coarse-grained, mottled pink-gray and brown, with vitreous quartz, feldspar, and dark mica; hardness about 6–7 Mohs, no consistent cleavage as a whole, specific gravity approximately 2.6–2.7.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic mountain-building events. The rough surface indicates weathering or mechanical breakage.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and building material; small unattractive fragments have minimal decorative value.
Geological facts
Visible interlocking grains distinguish granite from glass or many fine-grained rocks. Pink coloration commonly reflects potassium feldspar, while dark flakes are biotite or hornblende.
Field identification & locations
Identify it by its coarse interlocking crystals and speckled appearance; a glassy surface, hardness, and lack of bubbles support a natural rock origin. Common worldwide, especially in continental mountain belts.
