igneous
Weathered granite and granitoid pebbles
Granite (quartz, feldspar, and mica; exact rock type cannot be confirmed from the image)
AI-generated identification · may be incorrectPebble-sized, rounded specimens with mottled gray, cream, and dark green-brown coloring and a dull, weathered surface. Granite is typically coarse-grained, with Mohs hardness about 6–7; crystals are interlocking and show no prominent cleavage as a whole rock.
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Physical properties
Pebble-sized, rounded specimens with mottled gray, cream, and dark green-brown coloring and a dull, weathered surface. Granite is typically coarse-grained, with Mohs hardness about 6–7; crystals are interlocking and show no prominent cleavage as a whole rock.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, commonly during continental crust formation. These rounded pieces were likely worn down by water or other transport; their geological age cannot be determined visually.
Uses & applications
Granite is widely used as dimension stone, paving, countertops, and aggregate; these small pieces are mainly suitable for collecting or decoration.
Geological facts
Granite’s visible light and dark grains commonly include quartz and feldspar with dark mica or amphibole.
Field identification & locations
Look for interlocking grains, including hard glassy quartz and feldspar; rounded edges indicate abrasion during transport. Granitic rocks occur widely in continental regions and river gravels.
