mineral

Milky quartz pebble

Quartz (SiO₂), cryptocrystalline to massive variety

AI-generated identification · may be incorrect

Typically white, translucent to opaque, with a vitreous-to-waxy luster and no visible cleavage; hardness 7 Mohs, hexagonal crystal structure, and specific gravity about 2.65. The rounded shape indicates natural water wear or tumbling.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; milky opacity results from microscopic fluid inclusions or fractures. Quartz is widespread from Precambrian terrains to modern river and beach deposits.

Uses & applications

Used for glass, electronics, abrasives, engineered stone, and construction aggregate; attractive pieces are collected or used in crafts and simple jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and resists weathering, commonly surviving as rounded stream gravel. This specimen’s plain white appearance is consistent with common milky quartz rather than a rare gemstone variety.

Field identification & locations

Identify by its white translucent appearance, glassy fracture, lack of cleavage, and ability to scratch ordinary glass; a steel blade generally will not scratch it. Common worldwide in quartz veins, granites, pegmatites, and alluvial gravels.