igneous
Granite-like rock
Coarse-grained felsic intrusive rock, likely granite or granodiorite
AI-generated identification · may be incorrectGray, speckled, granular texture with visible quartz and feldspar; likely Mohs hardness 6–7, vitreous-to-dull luster, interlocking crystals, and no obvious cleavage as a whole rock. Exact identification is limited by the image.
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Physical properties
Gray, speckled, granular texture with visible quartz and feldspar; likely Mohs hardness 6–7, vitreous-to-dull luster, interlocking crystals, and no obvious cleavage as a whole rock. Exact identification is limited by the image.
Formation & geological history
Formed when silica-rich magma cooled slowly deep underground, allowing large crystals to grow; commonly Precambrian to younger, depending on locality. Weathering has rounded and roughened the surface.
Uses & applications
Used widely as building stone, crushed aggregate, monuments, countertops, and paving; ordinary hand specimens generally have little commercial collector value.
Geological facts
Granite commonly contains quartz, alkali feldspar, plagioclase, and minor biotite or amphibole. Granodiorite is similar but typically has more plagioclase and darker minerals.
Field identification & locations
Look for a visibly crystalline “salt-and-pepper” texture, quartz grains that resist scratching, and feldspar grains that may show cleavage faces. Common worldwide in continental crust and exposed mountain batholiths.
