sedimentary

Banded Sandstone Pebble

Arenite (Quartz Sandstone with iron oxide laminae)

AI-generated identification · may be incorrect

Hardness: 6 - 7 on the Mohs scale; Color: Tan, beige, or brownish-grey with distinctive reddish-orange to rust-brown iron-stained bands; Luster: Dull to earthy; Texture: Granular, clastic, well-rounded by fluvial or glacial transport; Specific gravity: ~2.2 - 2.8

Hardness: 6 - 7 on the Mohs scale
Luster: Dull to earthy

Identified November 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of sand-sized silicate grains (predominantly quartz) in ancient riverbeds, deltas, or beaches. The distinct reddish bands represent bedding planes or cross-laminations concentrated with iron oxides (hematite or goethite). Later weathered and naturally smoothed by water and abrasive action in a river or stream.

Uses & applications

Commonly used in landscaping, river rock decor, aggregate, and as a natural specimen for educational collections.

Geological facts

The parallel reddish stripes are preserved sedimentary laminations, showing how sediments settled in subtle pulses millions of years ago before lithifying into solid stone.

Field identification & locations

Identified by its gritty or sugary sandpaper-like granular surface, distinct layered sedimentary stripes, and smooth, oblong rounded shape typical of river tumbling. Widely found in gravel bars, dry creek beds, and glaciated regions globally.