mineral
Quartz Pebble (Chalcedony/Chert)
Silicon Dioxide (SiO2)
Mohs hardness of 7, yellowish-tan to translucent beige color, waxy to vitreous luster, microcrystalline structure, conchoidal fracture, no distinct cleavage, specific gravity approximately 2.65.
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Physical properties
Mohs hardness of 7, yellowish-tan to translucent beige color, waxy to vitreous luster, microcrystalline structure, conchoidal fracture, no distinct cleavage, specific gravity approximately 2.65.
Formation & geological history
Formed via precipitation of silica-rich fluids in cavities, veins, or sedimentary environments, subsequently eroded and rounded by stream or wave action into a water-worn pebble.
Uses & applications
Commonly collected as river rocks, used in lapidary arts, tumbling, landscape decoration, and aggregate materials in construction.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust. Water-worn quartz pebbles often develop smooth, rounded surfaces over thousands of years of alluvial transport.
Field identification & locations
Identified by its hardness (scratches glass), waxy luster, and lack of cleavage. Frequently found in riverbeds, lake shores, and gravel deposits worldwide. Ideal candidate for rock tumbling.
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