sedimentary

Sandstone

Sandstone (SiO2 with iron oxides and clay)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: yellowish-brown, tan, to orange due to iron oxide staining; Luster: earthy, dull; Grain structure: medium-grained gritty texture with micro-bedding layers

Hardness: 6-7 on Mohs scale
Color: yellowish-brown, tan, to orange due to iron oxide staining
Luster: earthy, dull

Identified July 26, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: yellowish-brown, tan, to orange due to iron oxide staining; Luster: earthy, dull; Grain structure: medium-grained gritty texture with micro-bedding layers

Formation & geological history

Formed by the compaction and cementation of sand-sized mineral particles or rock fragments, typically in riverbeds, lakes, or desert environments over millions of years.

Uses & applications

Widely used as a building material, paving stone, aggregate, and for decorative masonry.

Geological facts

Sandstone matrix often preserves ancient ripple marks, cross-bedding, and trace fossils from prehistoric environments.

Field identification & locations

Identified in the field by its distinctive gritty feel, visible sand grains, layered appearance, and resistance to effervescence when tested with acid.