mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to cream, translucent to opaque, with a vitreous-to-waxy luster and conchoidal fracture; quartz is trigonal and lacks cleavage. The rounded shape indicates natural abrasion or tumbling.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallize in veins or cavities, commonly during igneous and metamorphic processes; the specimen’s exact geological age is indeterminate. Weathering and transport rounded it, or it may be artificially tumbled.

Uses & applications

Used in glassmaking, ceramics, abrasives, electronics, countertops, and decorative stonework; attractive pieces are sold as lapidary or collection specimens.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. It can scratch ordinary glass and is not typically scratched by a steel knife.

Field identification & locations

Common in quartz veins, stream gravels, beaches, and glacial deposits worldwide. Confirm with hardness testing, glass-scratching ability, and lack of cleavage; avoid confusing it with calcite, which is much softer.