mineral
Quartz Pebble (Chalcedony / Agate pebble)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, waxy to vitreous luster, pale yellowish-white color, no cleavage, and a conchoidal fracture.
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Physical properties
Mohs hardness of 7, waxy to vitreous luster, pale yellowish-white color, no cleavage, and a conchoidal fracture.
Formation & geological history
Formed through precipitation of silica from groundwater or hydrothermal fluids, subsequently eroded, rounded, and transported by alluvial action.
Uses & applications
Commonly used in tumbled stone jewelry, decorative landscaping, and crystal healing.
Geological facts
River-tumbled quartz pebbles often show high polish and surface pitting caused by millions of impacts in stream beds over geological time.
Field identification & locations
Identify by its hardness (scratches glass readily), smooth water-worn texture, and translucent appearance; widely found in riverbeds and gravel deposits worldwide.
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