mineral

Quartz Pebble

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Yellowish, tan, or off-white due to mineral staining; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Yellowish, tan, or off-white due to mineral staining
Luster: Vitreous to greasy

Identified August 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed through weathering and water transport of quartz-rich rocks (such as granite or quartzite), where soft minerals break down and resistant quartz is smoothed by river or marine action over long geological timescales.

Uses & applications

Commonly used in landscaping, decorative gravel, tumbling, and as a natural specimen for rock collections.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust. Rounded pebbles like this often travel great distances in riverbeds before being deposited.

Field identification & locations

Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and smooth, water-worn shape. Found globally in riverbeds, beaches, and glacial deposits.