sedimentary
Jasper and Quartz Pebble
Silicon Dioxide (SiO2) microcrystalline quartz variety
Hardness of 7 on the Mohs scale, multicolored with white, yellow, and brown tones, vitreous to waxy luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, multicolored with white, yellow, and brown tones, vitreous to waxy luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed through the deposition and chemical precipitation of silica-rich fluids within sedimentary environments or hydrothermally altered rocks, later smoothed and rounded by wave action on a beach.
Uses & applications
Used as a decorative lapidary stone, in tumbling, for making polished jewelry, and as a popular specimen for beachcombers and rockhounds.
Geological facts
Beach pebbles like this are subjected to intense natural tumbling by waves and sand, which polishes away softer minerals and leaves behind durable quartz and chalcedony varieties.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), smooth water-worn surface, and characteristic multicolored jasper inclusions within a quartz matrix. Found globally on marine and river beaches.
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Quartz pebble
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