mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Likely Mohs hardness 7; cream-white to pale tan with a waxy-to-vitreous luster and irregular, translucent patches. Quartz has a trigonal crystal structure, but tumbling obscures crystal faces; it has no true cleavage and conchoidal fracture.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich fluids or melts in many rock types and is highly resistant to weathering; the pebble’s rounded surface suggests natural transport or tumbling. Quartz formed throughout geological time, so age cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and jewelry; this small tumbled piece is mainly decorative or collectible.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly survives erosion after its host rock breaks down.

Field identification & locations

Pale color, glassy patches, and hardness are consistent with quartz, though the photo cannot confirm the identification. Common worldwide in river gravels, beaches, and veins; a simple scratch test against glass can help distinguish it from softer stones.