igneous
Weathered granite or granitic rock
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pinkish-gray, dull to slightly sparkly, with irregular weathering pits; typical hardness is about 6–7 Mohs and specific gravity 2.63–2.75. The image is somewhat blurred, so exact mineral identification is limited.
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Physical properties
Coarse-grained, pinkish-gray, dull to slightly sparkly, with irregular weathering pits; typical hardness is about 6–7 Mohs and specific gravity 2.63–2.75. The image is somewhat blurred, so exact mineral identification is limited.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian through Mesozoic intrusive events; this cobble is likely an eroded surface fragment.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and landscaping material; ordinary hand specimens have little commercial value.
Geological facts
Pink coloration commonly reflects potassium feldspar, while dark flecks may be biotite or hornblende. Rounded edges and surface roughness indicate transport and weathering rather than crystal growth at the surface.
Field identification & locations
Identify it by visible interlocking grains, pink/white feldspar, gray translucent quartz, and sparse black mica; it will not fizz with dilute hydrochloric acid. Common in continental shields, mountain belts, glacial deposits, stream gravels, and landscaping stone.
