igneous
Rounded granitic pebble
Likely granite or granodiorite; exact identification is limited by the image
AI-generated identification · may be incorrectCoarse, mottled tan-gray rock with visible light and dark mineral grains and a rounded, weathered surface. Typical granite hardness is about 6–7 Mohs; luster is mostly dull, with interlocking quartz, feldspar, and mica crystals.
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Physical properties
Coarse, mottled tan-gray rock with visible light and dark mineral grains and a rounded, weathered surface. Typical granite hardness is about 6–7 Mohs; luster is mostly dull, with interlocking quartz, feldspar, and mica crystals.
Formation & geological history
Formed as magma slowly cooled underground, likely hundreds of millions to billions of years ago; later exposed and rounded by weathering or transport in water or glacial ice.
Uses & applications
Primarily a natural specimen or paperweight; granite is widely used as dimension stone, paving, and aggregate.
Geological facts
The rounded shape is consistent with abrasion during transport, but the image does not reveal where it was collected.
Field identification & locations
Look for interlocking grains, pale feldspar or quartz, and scattered dark minerals; a fresh broken surface would help distinguish granite from other coarse igneous rocks. Rounded pebbles occur in riverbeds, beaches, and glacial deposits worldwide.
