mineral

Rounded milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Mohs hardness 7; white to translucent, vitreous-to-waxy luster, no cleavage, conchoidal fracture, and hexagonal crystal structure, though this specimen is water-worn and lacks visible crystals. Specific gravity is about 2.65.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in silica-rich igneous or metamorphic veins and later released by weathering and rounded by stream or beach transport. Quartz commonly formed throughout Earth’s geological history, so its exact age cannot be determined visually.

Uses & applications

Common quartz has low collector value but is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive varieties are used as decorative specimens and jewelry.

Geological facts

Its hardness allows it to scratch ordinary glass and steel, while its lack of cleavage helps it resist splitting. The cloudy appearance results from microscopic fluid inclusions, fractures, or impurities.

Field identification & locations

Identify it by its pale translucent color, glassy fracture, hardness, and lack of cleavage; a steel file should not scratch it. Common worldwide, especially in quartz veins, river gravels, beaches, and quartz-rich rocks.