sedimentary
River Pebble
Quartzite pebble
AI-generated identification · may be incorrectHardness 7 on Mohs scale, brownish-gray color, vitreous luster, cryptocrystalline structure, no cleavage, specific gravity ~2.65.
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Physical properties
Hardness 7 on Mohs scale, brownish-gray color, vitreous luster, cryptocrystalline structure, no cleavage, specific gravity ~2.65.
Formation & geological history
Formed through the natural weathering, erosion, and water-transport smoothing of parent rock in riverbeds over thousands to millions of years.
Uses & applications
Used primarily in landscaping, garden decoration, aquariums, and pathway paving.
Geological facts
Water tumbling rounds sharp edges of hard minerals like quartz, creating smooth, durable stones found globally in alluvial deposits.
Field identification & locations
Identify by smooth, rounded shape and high hardness scratching glass; commonly found in riverbanks and ancient stream beds.
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