mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness 7 on the Mohs scale, yellowish-tan to light brown color due to iron oxide staining, vitreous to dull luster, sub-conchoidal fracture, smooth water-worn texture.

Identified July 22, 2026More mineral →

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Physical properties

Hardness 7 on the Mohs scale, yellowish-tan to light brown color due to iron oxide staining, vitreous to dull luster, sub-conchoidal fracture, smooth water-worn texture.

Formation & geological history

Formed via crystallization from silica-rich fluids in igneous, metamorphic, or sedimentary environments. It became rounded over time through water or wind erosion in riverbeds, streams, or coastal areas.

Uses & applications

Commonly used in landscaping, river rock gravel mixtures, aggregate for construction, and as casual pocket rocks for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Small stream-worn pebbles like this often carry iron oxide micro-coatings that give them a warm, yellowish-tan color.

Field identification & locations

Can be identified in the field by its hardness (scratches glass readily), smooth rounded appearance, lack of cleavage, and resistance to chemical weathering. Extremely common in river beds, beaches, and glacial till deposits worldwide.