igneous
Quartz-rich granite pebble
Granite, composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectThe rounded specimen is mottled white, gray, and reddish-brown with a coarse, crystalline texture and glassy quartz grains. Typical granite hardness is about 6–7 Mohs; its minerals have distinct cleavage, though the rock itself does not.
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Physical properties
The rounded specimen is mottled white, gray, and reddish-brown with a coarse, crystalline texture and glassy quartz grains. Typical granite hardness is about 6–7 Mohs; its minerals have distinct cleavage, though the rock itself does not.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing visible crystals to grow. Its age cannot be determined from the image; granites occur in continental crust of many ages.
Uses & applications
Granite is widely used as building and paving stone, countertops, monuments, and landscaping material; small pebbles are mainly collected or decorative.
Geological facts
The visible color variation likely reflects intergrown quartz and feldspar, with darker minerals such as mica or amphibole.
Field identification & locations
Look for interlocking grains, a speckled appearance, and no layering or fossil patterns; this rounded example was likely weathered or tumbled. Granite is common in continental mountain belts and glacial or river deposits.
