mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Tan, white, or translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Tan, white, or translucent
Luster: Vitreous to waxy

Identified June 28, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Tan, white, or translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed via crystallization from silica-rich magma or precipitation from hydrothermal fluids. These specific rounded shapes are the result of mechanical weathering and transport in fluvial (river) or coastal environments over tens of thousands of years.

Uses & applications

Primary source of silica for glass manufacturing, electronics, and construction aggregate. These specific smoothed pebbles are often used in landscaping or as decorative drainage stones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is chemically stable and physically hard, which allows it to survive long-term erosion better than most other minerals.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and smooth, rounded water-worn texture. Found globally in riverbeds, beaches, and glacial till.