metamorphic
River Stone (Quartzite/Basalt)
Variable; often Quartzite (SiO2) or Basaltic rock
Hardness: 6-7 on Mohs scale. Color: Brownish-grey. Luster: Dull/Waxy. Texture: Smooth, rounded/tumbled by water. Cleavage: None visible.
- Hardness
- 6-7 on Mohs scale
- Color
- Brownish-grey
- Luster
- Dull/Waxy
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Brownish-grey. Luster: Dull/Waxy. Texture: Smooth, rounded/tumbled by water. Cleavage: None visible.
Formation & geological history
Formed through the smoothing of larger rock fragments in high-energy water environments like rivers or beaches. These common stones can range from hundreds of thousands to millions of years old.
Uses & applications
Used in landscaping, masonry, decorative aquariums, and home decor. Often used as 'worry stones' or for garden paths.
Geological facts
The rounded shape is the result of 'abrasion,' where the rock is repeatedly bumped against other rocks while carried by river currents, effectively acting as a natural tumbler.
Field identification & locations
Identify by its rounded, smooth surface and lack of sharp edges. Very common in riverbeds, glacial deposits, and coastal regions globally.
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