mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Creamy white to translucent beige
Luster: Vitreous to waxy

Identified July 14, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins. This specimen shows significant rounding and smoothing due to fluvial (river) or glacial transport over thousands of years.

Uses & applications

Commonly used in decorative landscaping, as a source of silica for glass manufacturing, and as a tumbling medium for rock enthusiasts.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its high hardness and chemical resistance allow it to survive long-term erosion, which is why it is the primary component of most river pebbles and beach sand.

Field identification & locations

Identified in the field by its hardness (it can scratch glass), lack of cleavage, and smooth, water-worn texture. These are ubiquitous in riverbeds, glacial tills, and beaches worldwide.