sedimentary
Quartz Pebble (Tumbled / River Pebble)
Silicon Dioxide (SiO2)
Mohs hardness: 7, Color: Off-white to pale tan with faint iron-oxide veining, Luster: Smooth/sub-vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Specific Gravity: ~2.65
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Physical properties
Mohs hardness: 7, Color: Off-white to pale tan with faint iron-oxide veining, Luster: Smooth/sub-vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Specific Gravity: ~2.65
Formation & geological history
Formed through weathering and erosion of quartz-bearing rocks (like granite or quartzite), rounded by wave or river action into a natural stream/beach pebble.
Uses & applications
Used for decorative landscaping, pocket stones, tumbling practice, and rock collections.
Geological facts
Quartz is one of the most abundant minerals on Earth's surface and resists mechanical and chemical weathering extremely well, which allows these smooth pebbles to survive for thousands of years in riverbeds and on coasts.
Field identification & locations
Identified by its hardness (scratches glass), smooth water-worn oblong shape, off-white color, and faint yellowish iron-staining along micro-fractures. Commonly found along rivers, streams, and ocean beaches worldwide.
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