sedimentary

Quartz-rich sandstone

Clastic sandstone, primarily quartz (SiO₂) grains with iron-oxide or clay cement

AI-generated identification · may be incorrect

Usually Mohs hardness 6–7 for quartz grains; tan to reddish-brown, dull to glassy granular luster, porous texture, and no cleavage. The visible specimen is fine- to medium-grained with possible iron staining and bedding or weathering surfaces.

Identified August 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented by silica, calcite, or iron oxides; its exact geological age cannot be determined from the photograph. Common in river, beach, dune, and shallow-marine sedimentary formations.

Uses & applications

Used widely as building stone, paving, aggregate, and silica source; attractive varieties are used decoratively. Small ordinary specimens generally have little commercial value.

Geological facts

Sandstone commonly preserves ripple marks, cross-bedding, and fossils, recording ancient environments. Quartz-rich varieties resist weathering and can form prominent cliffs and ridges.

Field identification & locations

Identify it by visible sand grains, gritty texture, and granular fracture; a streak or hand lens can help distinguish it from limestone or quartzite. Common worldwide, especially in sedimentary basins.