mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a glassy-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure. The rounded shape indicates water or abrasion wear, while its granular surface may reflect weathering or microcrystals.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallize in veins, cavities, or igneous rocks; the specimen may be geologically millions to billions of years old. Commonly released by weathering and transported into river or beach gravels.

Uses & applications

Used for glass, ceramics, abrasives, engineered stone, and ornamental objects; attractive pieces are collected but this small pebble has modest commercial value.

Geological facts

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

Field identification & locations

Identify it by its white translucency, hardness— it should scratch ordinary glass—and lack of cleavage; calcite, a common look-alike, is softer and reacts with dilute acid. Common in quartz veins, granitic terrains, and stream deposits worldwide.