mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster and no visible cleavage; Mohs hardness 7, specific gravity about 2.65, and a hexagonal crystal structure, though this specimen is irregular and rounded.

Identified September 3, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or igneous rocks; its cloudy appearance comes from microscopic fluid inclusions or fractures. Quartz ranges from Precambrian to recent in age and is found worldwide.

Uses & applications

Used in glassmaking, ceramics, foundry work, abrasives, electronics, and engineered stone; attractive pieces are collected but this small rough pebble has minimal commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under mechanical stress.

Field identification & locations

Identify it by its hardness, pale translucent color, glassy surfaces, and lack of cleavage; it should scratch ordinary glass but not be scratched by a steel knife. Common sources include quartz veins, stream gravels, and granitic terrains.