igneous
Weathered granite
Granite; predominantly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, gray to pink, speckled appearance with a dull to slightly vitreous luster; interlocking crystals, no strong cleavage as a whole. Hardness is roughly 6–7 Mohs; feldspar cleavage may be visible, and weathering has produced the rough, porous surface.
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Physical properties
Coarse-grained, gray to pink, speckled appearance with a dull to slightly vitreous luster; interlocking crystals, no strong cleavage as a whole. Hardness is roughly 6–7 Mohs; feldspar cleavage may be visible, and weathering has produced the rough, porous surface.
Formation & geological history
A plutonic igneous rock formed when silica-rich magma cooled slowly deep within Earth, allowing large crystals to grow. Its exact age cannot be determined from the image and may range from Precambrian to much younger depending on locality.
Uses & applications
Widely used for building stone, countertops, monuments, paving, and aggregate; attractive polished pieces may be used decoratively or as educational specimens.
Geological facts
The pink tones commonly reflect potassium feldspar, while dark flecks are usually biotite or hornblende. Surface decomposition can make granite crumble into sand and clay minerals.
Field identification & locations
Identify it by visible quartz, light and dark feldspar, and mica crystals in a random coarse mosaic; distinguish it from gneiss by the lack of mineral banding. Common worldwide in continental crust and exposed mountain ranges.
