igneous
Light-colored rounded granitic pebble
Likely granitoid, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectPale gray-white, fine-to-medium granular texture with dark mineral flecks; likely Mohs 6–7, vitreous to dull luster, no obvious cleavage as a whole, and specific gravity about 2.6–2.7. Rounded edges indicate stream abrasion.
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Physical properties
Pale gray-white, fine-to-medium granular texture with dark mineral flecks; likely Mohs 6–7, vitreous to dull luster, no obvious cleavage as a whole, and specific gravity about 2.6–2.7. Rounded edges indicate stream abrasion.
Formation & geological history
An intrusive igneous rock crystallized slowly from magma deep underground, probably millions to billions of years ago, then exposed and rounded by weathering and transport in a stream or gravel deposit.
Uses & applications
Commonly used as aggregate, road gravel, landscaping stone, and dimension stone; this small ordinary pebble has negligible jewelry or collector value.
Geological facts
The dark specks are likely biotite or hornblende, while the white portions are feldspar and possibly quartz. Exact identification requires a fresh surface, hand lens, and tests such as streak or hardness.
Field identification & locations
Look for interlocking light crystals, scattered black mica or amphibole, and hardness sufficient to scratch glass. Common in streambeds and glacial or alluvial gravels near granitic terrains.
