metamorphic
River Stone (Quartzite/Siltstone)
Metamorphosed Siliciclastic Rock (SiO2)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale); Color: Tan, brown, or grayish-beige; Luster: Dull to waxy; Texture: Fine-grained, smooth, and rounded due to fluvial erosion.
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, or grayish-beige
- Luster
- Dull to waxy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, or grayish-beige; Luster: Dull to waxy; Texture: Fine-grained, smooth, and rounded due to fluvial erosion.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone or siltstone. The rounded shape is a result of mechanical weathering and transport in a high-energy aquatic environment like a river or stream bed over thousands of years.
Uses & applications
Primarily used in decorative landscaping, garden paths, drainage systems, and as architectural accents. Select smooth specimens are used in stone massage or as worry stones.
Geological facts
The 'smoothness' of a river stone is a geological indicator of the distance it has traveled from its source; the more rounded it is, the more time it has spent being tumbled by water.
Field identification & locations
Identify in the field by its lack of sharp edges and water-worn patina. Common in river valleys, glacial outwash plains, and ancient streambeds. Collectors look for unique colors or symmetry.
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