mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, cream, or translucent yellowish; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, cream, or translucent yellowish
Luster: Vitreous to waxy

Identified June 1, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, cream, or translucent yellowish; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids or within igneous and metamorphic rocks. This specific specimen appears to be a water-worn or weathered fragment of vein quartz.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), abrasives, and as decorative gravel in landscaping.

Geological facts

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

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and soil as a result of erosion from larger quartz veins.