igneous
Tumbled granite pebble
Granite, a quartz–feldspar plutonic rock
AI-generated identification · may be incorrectRounded and polished, with mottled pink, gray, and brown grains; likely quartz, feldspar, and dark mica or amphibole. Granite minerals are typically Mohs 6–7, with vitreous quartz and cleavage in feldspar; exact composition and specific gravity cannot be determined from the image.
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Physical properties
Rounded and polished, with mottled pink, gray, and brown grains; likely quartz, feldspar, and dark mica or amphibole. Granite minerals are typically Mohs 6–7, with vitreous quartz and cleavage in feldspar; exact composition and specific gravity cannot be determined from the image.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing crystals to grow; granites occur in continental crust of many ages.
Uses & applications
Used as decorative stone, aggregate, and building material; tumbled pebbles are sold for crafts and collections.
Geological facts
Granite is a rock composed of several minerals, not a single mineral; polishing highlights its contrasting grains.
Field identification & locations
The visible interlocking, differently colored grains support a granite identification, though the image cannot confirm it. Common in continental mountain belts and glacial or stream gravels; value depends on size, polish, and provenance.
