sedimentary

Beach Pebbles and Jasper

Quartz / Microcrystalline Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness 6.5-7 on Mohs scale; displays various colors including reddish pink (jasper/chalcedony), dark green, basaltic black, grey, and smooth cream tones; dull to waxy/vitreous luster; rounded and polished by natural wave action

Identified July 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through weathering, erosion, and transport by river or ocean currents. The smooth, rounded shapes are created by friction and tumbling against sand and other stones in water environments over hundreds to thousands of years.

Uses & applications

Used in decorative landscaping, aquarium decor, tumbled rock collections, craft projects, and lapidary arts.

Geological facts

Beach pebbles often contain microcrystalline quartz, chert, or jasper, which make them hard enough to resist complete disintegration in rough marine environments, instead grinding down into smooth cabochon-like pebbles.