mineral

Rounded quartz-rich beach pebble

Likely milky quartz or quartzite (SiO₂)

AI-generated identification · may be incorrect

White to pale gray, opaque, dull-to-glassy luster, fine-grained and water-rounded; quartz hardness is Mohs 7, with no cleavage and conchoidal fracture. The image is somewhat blurred, so exact identification is uncertain.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Likely weathered from quartz-bearing igneous or metamorphic bedrock, then transported and polished by waves or stream action. Quartz formed in various geological settings from Precambrian to modern ages.

Uses & applications

Commonly collected as a beach stone, landscaping aggregate, or craft material; attractive pieces may be polished, but this specimen has little commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and strongly resists weathering, allowing it to accumulate in beaches and gravel bars.

Field identification & locations

Test with a steel file or glass: genuine quartz should scratch glass; it commonly appears alongside dark minerals and feldspar in beach sediment. Common worldwide, especially on quartz-rich coasts and rivers.