mineral

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Yellow-brownish to yellowish-tan; Luster: Waxy to vitreous; Crystal structure: Hexagonal/trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Yellow-brownish to yellowish-tan
Luster: Waxy to vitreous

Identified July 25, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Yellow-brownish to yellowish-tan; Luster: Waxy to vitreous; Crystal structure: Hexagonal/trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through fluvial (river) erosion and weathering of quartz veins or iron-stained sedimentary/metamorphic rocks, resulting in a smooth, water-worn pebble.

Uses & applications

Commonly used as decorative river rock, landscaping aggregate, tumbling material for rock collectors, and occasionally in industrial construction.

Geological facts

Yellow coloration in quartz pebbles is often caused by micro-inclusions of iron oxides (like limonite or goethite) or surface staining from iron-rich soil and water over long periods.

Field identification & locations

Identified in the field by its hardness (scratches glass readily), rounded smooth water-worn surface, and dull to waxy luster. Found widespread along riverbeds, beaches, and gravel deposits worldwide.