mineral

White quartz pebble

Quartz (SiO₂), likely massive milky quartz

AI-generated identification · may be incorrect

Opaque white to pale gray with a dull-to-vitreous luster and rounded, water-worn shape. Quartz has Mohs hardness 7, a hexagonal crystal structure, no cleavage, and specific gravity about 2.65; individual crystals are not visible here.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in veins or cavities, then weathered and rounded by transport in water. Quartz occurs in rocks of many geological ages; the pebble’s source and age cannot be determined from the image.

Uses & applications

Quartz is widely used in glass, ceramics, electronics, and construction; attractive pieces are used for jewelry and collections.

Geological facts

Quartz is one of Earth’s most abundant minerals and is resistant to weathering, allowing it to persist in river and beach sediments.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and a white streak; rounded edges suggest transport. Common worldwide in veins, river gravels, and beaches.