sedimentary

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Tan, brown, and cream with distinct banding; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific gravity: approx. 2.0-2.6

Hardness: 6-7 (Mohs scale)
Color: Tan, brown, and cream with distinct banding
Luster: Dull/Earthy

Identified May 16, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, brown, and cream with distinct banding; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific gravity: approx. 2.0-2.6

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments of sand size over millions of years, often in ancient riverbeds or deserts. The banding comes from rhythmic shifts in mineral deposition.

Uses & applications

Used primarily for decorative purposes, river rock landscaping, lapidary art (cabochons), and historically as a construction material.

Geological facts

The distinct banding is often caused by 'Liesegang rings', which are secondary precipitates of iron oxides that produce the 'landscape' or 'picture' appearance. These river-worn specimens are often called 'Zen stones'.

Field identification & locations

Identify by its gritty texture and visible stratigraphy or layering. Commonly found in riverbeds, canyons, and sedimentary basins. Look for the parallel lines indicating sedimentary bedding.