mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, color ranges from milky white to translucent or slightly yellowish-brown due to weathering, vitreous to greasy luster, hexagonal crystal system when well-formed (though this specimen is rounded by transport), no true cleavage, specific gravity of 2.65.

Identified August 5, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the accumulation and weathering of quartz-rich rocks (like granite or pegmatite) over geological timescales, followed by aqueous transport and erosion that smoothed the edges into a pebble.

Uses & applications

Used in landscaping, decorative stone, glass manufacturing, abrasives, and as specimens for amateur rock collectors.

Geological facts

Quartz is one of the most abundant and durable minerals in the Earth's continental crust. Its high resistance to both chemical weathering and mechanical abrasion allows it to survive long journeys in rivers and on beaches.

Field identification & locations

Found worldwide in stream beds, river gravels, beaches, and sedimentary deposits. Easily identified in the field by its high hardness (scratches glass) and conchoidal fracture if broken.