igneous
Granite (likely weathered granitic rock)
Granite; primarily quartz (SiO₂), feldspars, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled gray-pink rock with granular texture and possible mica sparkle; quartz hardness 7, feldspar 6, mica 2–3; generally non-cleaved overall, with vitreous quartz and pearly mica luster. Exact identification is limited by the photograph.
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Physical properties
Coarse-grained, speckled gray-pink rock with granular texture and possible mica sparkle; quartz hardness 7, feldspar 6, mica 2–3; generally non-cleaved overall, with vitreous quartz and pearly mica luster. Exact identification is limited by the photograph.
Formation & geological history
Slow cooling of silica-rich magma deep within continental crust, producing interlocking crystals; commonly Precambrian to Mesozoic in age depending on locality. Weathering has rounded and roughened the surface.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and building stone; rough hand specimens have modest collecting value.
Geological facts
Granite’s visible pink tones usually reflect potassium feldspar, while dark glittering flakes are biotite or hornblende. It typically forms large batholiths and plutons.
Field identification & locations
Identify by its interlocking visible quartz, feldspar, and dark mica grains, unlike layered gneiss or uniformly fine-grained basalt. Common worldwide, especially in continental mountain belts; a fresh broken surface is more diagnostic than the weathered exterior.
