mineral
Quartz Pebble (Beach Chalcedony)
Silicon Dioxide (SiO2)
Hardness of 7 on Mohs scale, translucent to waxy luster, light grey to off-white body color, smooth rounded shape due to water erosion, trigonal crystal system
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Physical properties
Hardness of 7 on Mohs scale, translucent to waxy luster, light grey to off-white body color, smooth rounded shape due to water erosion, trigonal crystal system
Formation & geological history
Formed through precipitating silica-rich fluids in cavities or veins, which subsequently eroded and became rounded by wave and river action along coastlines or stream beds.
Uses & applications
Used primarily in lapidary arts, jewelry making, tumbling, and beachcombing rock collections.
Geological facts
Beach pebbles made of microcrystalline quartz or chalcedony are extremely durable and can survive millions of years of mechanical weathering by ocean waves.
Field identification & locations
Identified by its high hardness (scratches glass), smooth waxy feel, translucent appearance under sunlight, and lack of cleavage planes. Commonly found on gravel beaches and riverbanks globally.
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