igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectVisible interlocking grains of pale quartz and feldspar with dark mica or amphibole; typically Mohs 6–7, vitreous to dull, with no preferred cleavage at the rock scale. The image shows a rounded, mottled gray-white pebble; exact minerals cannot be confirmed visually.
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Physical properties
Visible interlocking grains of pale quartz and feldspar with dark mica or amphibole; typically Mohs 6–7, vitreous to dull, with no preferred cleavage at the rock scale. The image shows a rounded, mottled gray-white pebble; exact minerals cannot be confirmed visually.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing crystals to grow; its age depends on the source outcrop and cannot be determined from the image. The rounded shape likely reflects abrasion during transport by water or ice.
Uses & applications
Granite is widely used for building stone, countertops, paving, and aggregate; this small pebble is mainly suitable for collecting or landscaping.
Geological facts
Granite commonly consists chiefly of quartz and feldspars, with mica or amphibole as darker minerals.
Field identification & locations
Look for a speckled, crystalline texture with grains visible to the naked eye and distinguish it from uniform fine-grained rocks. Granite occurs worldwide in continental crust; this specimen’s origin is unknown.
