sedimentary
Banded Sandstone (Water-worn Pebble)
Arenite with mineral banding
Hardness: 6-7 (Mohs); Color: Dark grey matrix with tan or light brown parallel bands; Luster: Dull/Earthy; Texture: Fine-grained, granular; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Dark grey matrix with tan or light brown parallel bands
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Dark grey matrix with tan or light brown parallel bands; Luster: Dull/Earthy; Texture: Fine-grained, granular; Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation of sand-sized mineral particles or rock fragments, cemented together by pressure and silica or calcite. The distinct bands represent different layers of deposition or mineral staining (diffusion banding) over millions of years, later smoothed by water erosion.
Uses & applications
Commonly used as decorative gravel, in landscaping, or as a pocket stone for collectors. Structurally, sandstone is used in construction and paving.
Geological facts
The straight lines are often called 'rhythmically bedded' layers. This specific specimen has been naturally tumbled by a river or beach environment, giving it its smooth, rounded 'pocket stone' shape.
Field identification & locations
Identified by its visible grains and distinct horizontal layering. Found in riverbeds, lakeshores, and coastal areas globally. It feels slightly gritty compared to igneous rocks.
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