mineral

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Opaque white to pale gray, with a vitreous-to-dull luster and irregular fracture; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage. The image shows a small, rounded, worn specimen; its exact identity cannot be confirmed from appearance alone.

Identified October 6, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids in veins and igneous or metamorphic rocks, and may later be weathered into stream or beach pebbles. Its age cannot be determined from the photograph.

Uses & applications

Quartz is used in glassmaking, electronics, abrasives, and decorative objects; this small piece is mainly suitable for collecting or craft use.

Geological facts

Quartz is one of Earth’s most abundant minerals and often survives weathering that breaks down surrounding rock.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and a conchoidal fracture; milky quartz occurs worldwide in veins and many rock types. The pictured pebble’s rounded shape suggests transport or handling, but does not establish its source.