sedimentary
River Pebble (Quartzite / Sandstone)
SiO2 (Quartz-rich sedimentary/metamorphic rock)
Hardness: 6-7 on Mohs scale. Color: Tan, brown, reddish-brown. Luster: Dull to sub-vitreous. Texture: Smooth, water-worn, fine-grained. Specific Gravity: ~2.65.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, reddish-brown
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Tan, brown, reddish-brown. Luster: Dull to sub-vitreous. Texture: Smooth, water-worn, fine-grained. Specific Gravity: ~2.65.
Formation & geological history
Formed through the erosion and deposition of silica-rich sediments, subsequently rounded and smoothed over time by water action in streams, rivers, or beach environments.
Uses & applications
Used in landscaping, decorative stone arrangements, construction aggregates, lapidary polishing practice, and casual rock collecting.
Geological facts
Water-worn pebbles can travel hundreds of miles along riverbeds over thousands of years, gaining their distinctive smooth, elongated shape from continuous friction against other stones.
Field identification & locations
Identify by its extremely smooth, rounded shape with no sharp edges and hard, fine-grained silica texture. Commonly found in riverbeds, gravel pits, lakeshores, and ocean beaches worldwide.
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