sedimentary

Quartz-rich sandstone

Sandstone, chiefly quartz (SiO₂) with likely feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Tan-brown, fine- to medium-grained, gritty surface with weak sparkle; typically Mohs 6–7 for quartz grains, but friable overall. Nonmetallic, dull to slightly glassy luster; clastic granular texture, no obvious cleavage, and variable porosity.

Identified September 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Lithified sand deposited by rivers, beaches, dunes, or shallow marine environments, then compacted and cemented—commonly during the Paleozoic to Cenozoic, though the image cannot establish age. Brown coloration likely reflects iron-oxide staining.

Uses & applications

Used as building stone, paving, aggregate, and silica source; attractive pieces may be collected, but this specimen has little jewelry value.

Geological facts

Sandstone is classified by grain size, composition, sorting, and cement; quartz-rich varieties are relatively resistant to weathering and can form cliffs or arches.

Field identification & locations

Identify by visible sand-sized grains, gritty feel, and lack of crystalline interlocking texture; acid reaction should be absent unless carbonate cement is present. Common worldwide in sedimentary basins.