igneous
Granite cobble
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectPink-gray with visible interlocking quartz, feldspar, and dark mica or amphibole grains; typically Mohs 6–7, vitreous quartz and dull-to-pearly feldspar, with no consistent cleavage at the rock scale. The image does not allow precise mineral identification.
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Physical properties
Pink-gray with visible interlocking quartz, feldspar, and dark mica or amphibole grains; typically Mohs 6–7, vitreous quartz and dull-to-pearly feldspar, with no consistent cleavage at the rock scale. The image does not allow precise mineral identification.
Formation & geological history
Formed by slow cooling of silica-rich magma deep in the crust; granite spans much of Earth’s geological history and occurs in continental plutons. This rounded cobble was likely smoothed by stream or beach transport.
Uses & applications
Commonly used as dimension stone, paving, countertops, monuments, and crushed aggregate; this cobble is mainly a natural or decorative specimen.
Geological facts
Granite’s visible grains record slow underground cooling, and its quartz-rich composition makes it relatively resistant to weathering.
Field identification & locations
Look for coarse, interlocking light quartz and feldspar with scattered dark minerals; rounded edges suggest transport in water. Granite is widespread in continental mountain belts and exposed shields.
