mineral

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, with a vitreous-to-waxy luster and no visible cleavage. It has a crystalline trigonal structure, though the rounded surface is probably naturally water-worn or tumbled.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in igneous or metamorphic rocks, commonly in veins; the pebble was later released by weathering and rounded by stream or beach abrasion. Quartz is found in rocks of nearly all geological ages.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are collected or used as decorative stones. This small, opaque specimen has minimal commercial value.

Geological facts

Milky color results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Identify it by its white translucency, glassy surfaces, lack of cleavage, and ability to scratch ordinary glass; a steel blade will not scratch it. Common worldwide, especially in quartz veins, river gravels, and beaches.