sedimentary

Sandstone (Calcareous)

Clastic sedimentary rock (primarily SiO2 with CaCO3 cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: tan/buff/grey, Luster: earthy/dull, Crystal structure: granular clastic texture, Cleavage: none, Specific gravity: 2.2-2.8

Identified July 21, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: tan/buff/grey, Luster: earthy/dull, Crystal structure: granular clastic texture, Cleavage: none, Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in marine or desert environments where water or wind concentrates quartz grains.

Uses & applications

Commonly used as a building material in masonry, paving stones, and for aggregate in construction.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. It often contains fossils and creates important aquifers for groundwater storage.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and often visible layers or bedding planes. It can be found in sedimentary basins and cliff faces globally.