mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, translucent to grey; Luster: Vitreous to waxy (when water-worn); Crystal Structure: Hexagonal (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, translucent to grey
Luster: Vitreous to waxy (when water-worn)

Identified July 12, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the crystallization of silica-rich magma or precipitation in hydrothermal veins. This specific specimen has been smoothed and rounded by fluvial or marine erosion (water action) over long periods.

Uses & applications

Used in glass making, abrasive blasting, high-purity silica for electronics, landscaping, and as a semi-precious stone for lapidary work.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is chemically stable and physically durable, which is why it often remains as pebbles long after other minerals have weathered away.

Field identification & locations

Identify by its hardness (will scratch glass), lack of cleavage, and translucent appearance. Commonly found in riverbeds, beaches, and glacial deposits globally.