igneous
Weathered granite pebble
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz and feldspar with dark mica or amphibole
AI-generated identification · may be incorrectVisible interlocking grains of pale quartz and feldspar with scattered dark minerals; typically Mohs 6–7, granular texture, vitreous quartz, and no cleavage at the rock scale. Its rounded shape and subdued surface are consistent with weathering and transport.
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Physical properties
Visible interlocking grains of pale quartz and feldspar with scattered dark minerals; typically Mohs 6–7, granular texture, vitreous quartz, and no cleavage at the rock scale. Its rounded shape and subdued surface are consistent with weathering and transport.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing large crystals to grow; its age depends on source and may range from hundreds of millions to billions of years. The pebble was likely rounded by stream or shoreline abrasion.
Uses & applications
Granite is widely used as dimension stone, paving, countertops, monuments, and crushed aggregate; this small rounded specimen is mainly suitable for collecting or display.
Geological facts
The salt-and-pepper appearance reflects contrasting light-colored quartz/feldspar and dark mica or amphibole. The exact mineral proportions and source cannot be determined from the photograph alone.
Field identification & locations
Look for coarse, interlocking crystals and abundant pale quartz/feldspar with scattered dark grains; unlike sedimentary rocks, it lacks layers or cemented fragments. Granite occurs worldwide, especially in continental crust and mountain belts.
