mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: cloudy white to translucent tan, Luster: vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: poor (conchoidal fracture)

Identified July 20, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: cloudy white to translucent tan, Luster: vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: poor (conchoidal fracture)

Formation & geological history

Formed through hydrothermal processes in veins or as a major constituent of igneous rocks; later weathered and water-worn into a pebble shape via fluvial or coastal erosion.

Uses & applications

Used in glassmaking, abrasives, construction aggregates, and as decorative gravel; minor uses in low-cost river stone jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Commonly identified by its ability to scratch glass and lack of cleavage. Found in riverbeds, beaches, and soil worldwide. It is a fundamental marker for quartz-rich geological environments.