mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: Translucent white to milky white, Luster: Vitreous (glassy) to waxy when water-worn, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified March 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specific specimen is a 'clast' that has been eroded from its parent rock and rounded by high-energy water environments like beaches or riverbeds over thousands of years.

Uses & applications

Used in glassmaking, abrasives, and electronics (piezoelectric properties). In this tumbled form, it is common for decorative landscaping, 'lucky stone' collecting, and rock tumbling hobbies.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. White quartz is often called 'Milky Quartz' due to microscopic fluid inclusions trapped during crystal growth.

Field identification & locations

Identify in the field by its ability to scratch glass and lack of cleavage (it breaks in irregular, shell-like curves). This specimen shows 'frosted' surface textures typical of beach-worn pebbles. Commonly found on shorelines globally.