igneous
Polished granite pebble
Granite, a quartz–feldspar plutonic rock with dark accessory minerals
AI-generated identification · may be incorrectCoarse, mottled cream, gray, and black grains with a polished surface; likely quartz (Mohs 7), feldspars (about 6), and biotite or amphibole. Granite has no consistent cleavage and typically has specific gravity around 2.6–2.7; exact properties cannot be confirmed from the image.
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Physical properties
Coarse, mottled cream, gray, and black grains with a polished surface; likely quartz (Mohs 7), feldspars (about 6), and biotite or amphibole. Granite has no consistent cleavage and typically has specific gravity around 2.6–2.7; exact properties cannot be confirmed from the image.
Formation & geological history
Formed as silica-rich magma cooled slowly underground, allowing visible crystals to grow; its age depends on source and could range from hundreds of millions to billions of years.
Uses & applications
Used as decorative stone, aggregate, countertops, and landscaping material; this pebble is mainly ornamental or collectible.
Geological facts
The rounded shape and sheen suggest water-worn and possibly polished stone, but the image alone cannot establish its exact rock type.
Field identification & locations
Look for interlocking, visible quartz and feldspar grains with scattered dark minerals; granite is common on continental shields and in mountain belts worldwide.
