sedimentary

Banded Sandstone (Water-worn Pebble)

Arenite with mineral banding

AI-generated identification · may be incorrect

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

Identified July 7, 2026More sedimentary →

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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.