sedimentary

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: light grey to tan, Luster: dull/earthy, Structure: clastic/granular texture with visible layering, Cleavage: None (conchoidal to uneven fracture).

Identified April 9, 2026More sedimentary →

Explore Sandstone (likely Graywacke or Arkose variant) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-7 (Mohs scale), Color: light grey to tan, Luster: dull/earthy, Structure: clastic/granular texture with visible layering, Cleavage: None (conchoidal to uneven fracture).

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) usually in riverbeds, deltas, or oceans. This specific specimen appears to be from a fluvial or riparian environment where water transport has rounded the edges over time.

Uses & applications

Commonly used as a building material, in asphalt and concrete production, and as a reservoir rock for oil and gas. In the field, it is often used for bank stabilization (riprap).

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Some sandstones are very resistant to weathering, making them excellent materials for ancient monuments and temples.

Field identification & locations

Identify by its gritty, sandpaper-like feel. It is found in any region with a history of sedimentary deposition. Collectors look for unique banding (Liesegang rings) or fossils within the matrix.