mineral

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Translucent yellowish-brown to tan due to iron oxidation. Luster: Vitreous to waxy. Crystal structure: Hexagonal/Trigonal (microcrystalline or massive pebble). Cleavage: None, exhibits conchoidal fracture.

Hardness: 7 on Mohs scale
Color: Translucent yellowish-brown to tan due to iron oxidation
Luster: Vitreous to waxy

Identified July 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed through igneous or hydrothermal quartz crystallization, which was later weathered, eroded, and rounded by fluvial (river) or coastal water action. The yellowish coloration comes from surface iron oxide/limonite staining.

Uses & applications

Commonly collected as river stones, used in lapidary art for rock tumbling, decorative landscaping, aggregate, and silica source in industrial manufacturing.

Geological facts

Quartz is one of the most resistant minerals to physical and chemical weathering. As other minerals breakdown, quartz grains survive and become smoothly rounded river pebbles and beach stones over thousands of years.

Field identification & locations

Identify in the field by its Mohs hardness of 7 (scratches glass and steel), lack of cleavage, translucent appearance, and smooth, rounded pebble shape typical of water-worn stones. Commonly found in riverbeds, gravel pits, and beaches worldwide.