mineral

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Smooth, rounded white to cream pebble with a vitreous-to-waxy surface and dark inclusions. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65; the image alone cannot confirm the inclusions or exact variety.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed in silica-rich veins or host rock and was later weathered and water-rounded. Quartz is common in rocks of many geological ages.

Uses & applications

Commonly used for ornaments, tumbling, and decorative stone; quartz also has major industrial uses in glassmaking and electronics.

Geological facts

Quartz is one of Earth’s most abundant minerals and resists weathering, so it often persists as rounded stream or beach pebbles.

Field identification & locations

Look for hardness sufficient to scratch glass and a lack of cleavage; the pebble’s smooth shape suggests transport by water. Similar pebbles occur worldwide in streams, beaches, and glacial deposits.