sedimentary
Waterworn Pebble / Quartzite
Metamorphic/Sedimentary rock fragment
Hardness of 6-7 on the Mohs scale, grayish-brown color, dull to slightly waxy luster, amorphous or cryptocrystalline structure, conchoidal fracture, smooth and rounded surface due to water transport.
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Physical properties
Hardness of 6-7 on the Mohs scale, grayish-brown color, dull to slightly waxy luster, amorphous or cryptocrystalline structure, conchoidal fracture, smooth and rounded surface due to water transport.
Formation & geological history
Formed through the weathering and erosion of parent rock, subsequently transported by rivers or wave action where tumbling smooths the edges over thousands to millions of years.
Uses & applications
Landscaping, decorative stones, garden paths, and general geological specimen collection.
Geological facts
River pebbles undergo natural tumbling which selectively wears away softer minerals, leaving behind durable components like quartz and quartzite.
Field identification & locations
Commonly found in riverbeds, lake shores, and beaches worldwide. Identify by its smooth, water-worn shape and high hardness.
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