sedimentary

Banded sandstone pebble

Quartz-rich sandstone, likely arkosic or ferruginous sandstone

AI-generated identification · may be incorrect

Fine- to medium-grained, pale tan, pink, and reddish layers with earthy to slightly satin luster; composed mainly of quartz with feldspar and iron oxides. Typically Mohs hardness 6–7 for grains, but the rock is porous and has no consistent cleavage.

Identified August 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in beds, with color banding produced by changing sediment composition or iron-oxide staining. The specimen’s exact age and locality cannot be determined from the image; sandstone ranges from Precambrian to modern geological settings.

Uses & applications

Used as building stone, paving, aggregate, and decorative rock; attractive banded pieces are collected or polished, though this example appears common rather than gem quality.

Geological facts

Visible bedding and differential weathering are characteristic sedimentary features. The curved shape likely results from stream abrasion or natural weathering.

Field identification & locations

Identify by gritty texture, visible sedimentary layers, and lack of crystalline interlocking grains; a hand lens and acid test can help distinguish carbonate cement. Common worldwide, especially in ancient river, dune, and coastal deposits.