igneous
Weathered granite
Granite; quartz–feldspar–mica plutonic rock
AI-generated identification · may be incorrectCoarse, speckled texture with pale feldspar/quartz and dark biotite or amphibole; uneven granular fracture, little cleavage as a whole, Mohs hardness about 6–7, vitreous to dull luster, specific gravity ~2.6–2.8.
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Physical properties
Coarse, speckled texture with pale feldspar/quartz and dark biotite or amphibole; uneven granular fracture, little cleavage as a whole, Mohs hardness about 6–7, vitreous to dull luster, specific gravity ~2.6–2.8.
Formation & geological history
Slow cooling of silica-rich magma deep in the crust produced interlocking crystals, generally during Precambrian to Phanerozoic pluton formation; orange-brown surfaces reflect weathering of iron-bearing minerals.
Uses & applications
Commonly used as dimension stone, countertops, paving, monuments, aggregate, and landscaping rock; this irregular specimen has modest collector value.
Geological facts
The visible “salt-and-pepper” pattern is diagnostic of phaneritic granite, though the exact variety may be granodiorite or a weathered gneiss without a fresh surface.
Field identification & locations
Look for interlocking grains visible to the naked eye, abundant light quartz/feldspar, and scattered black mica or amphibole; common worldwide in continental mountain belts and shield terrains. A fresh broken face and streak/acid tests help distinguish it from gneiss or quartzite.
