sedimentary
River Rock
Polished Quartzite / Silicified Sedimentary Rock
Hardness: 6-7 on Mohs scale; Color: Brownish-tan with weathered surface; Luster: Dull to vitrious when fractured; Crystal structure: Cryptocrystalline to microcrystalline; Cleavage: None; Specific gravity: 2.65
- Hardness
- 6-7 on Mohs scale
- Color
- Brownish-tan with weathered surface
- Luster
- Dull to vitrious when fractured
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Brownish-tan with weathered surface; Luster: Dull to vitrious when fractured; Crystal structure: Cryptocrystalline to microcrystalline; Cleavage: None; Specific gravity: 2.65
Formation & geological history
Formed through mechanical weathering and fluvial transport, where irregular parent rock fragments were rounded and smoothed by water action in a riverbed over thousands to millions of years.
Uses & applications
Used in landscaping, gardening, decorative pathways, and general construction.
Geological facts
River rocks are naturally tumbled by the continuous abrasive action of water and other sediment, which rounds off sharp edges and corners.
Field identification & locations
Easily identified by its smooth, rounded, water-worn shape and weathered exterior, commonly found in active or ancient riverbeds, streams, and glacial outwash deposits worldwide.
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