igneous
Weathered granite-like rock
Granite, likely biotite-bearing; exact identification requires testing
AI-generated identification · may be incorrectCoarse-grained, speckled gray-yellow material with dark mica or amphibole and pale quartz/feldspar; likely Mohs 6–7, vitreous to dull luster, no obvious cleavage as a whole rock, and density around 2.6–2.8 g/cm³.
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Physical properties
Coarse-grained, speckled gray-yellow material with dark mica or amphibole and pale quartz/feldspar; likely Mohs 6–7, vitreous to dull luster, no obvious cleavage as a whole rock, and density around 2.6–2.8 g/cm³.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, producing interlocking crystals; its age depends on locality and may range from Precambrian to much younger Phanerozoic bodies.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and landscaping rock; attractive hand specimens have modest collecting value.
Geological facts
The yellow-brown surface likely reflects weathering of feldspar and iron-bearing minerals rather than the rock’s fresh interior.
Field identification & locations
In the field, look for visible quartz, white or pink feldspar, and black mica in a granular texture; a steel nail generally will not scratch it, while quartz can scratch glass. Common worldwide in continental mountain belts and exposed plutons.
