mineral

Quartz pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: white to translucent with amber staining; Luster: vitreous (glassy) to waxy; Crystal structure: Hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: white to translucent with amber staining
Luster: vitreous (glassy) to waxy

Identified June 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins. This specimen shows signs of water-worn weathering, typical of alluvial or sedimentary transport.

Uses & applications

Used in construction, glass manufacturing, electronics (piezoelectric properties), and as decorative gravel or gemstones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is extremely resistant to both chemical and physical weathering, which is why it often remains as small pebbles while other minerals dissolve.

Field identification & locations

Identified by its hardness (cannot be scratched by a steel nail), lack of cleavage, and glassy appearance. Commonly found in riverbeds, beaches, and soil worldwide.