sedimentary

Weathered sandstone (likely arkosic sandstone)

Clastic sandstone, chiefly quartz and feldspar (SiO₂-rich framework)

AI-generated identification · may be incorrect

Typically Mohs 6–7 for grains but weakly cemented overall; tan to rusty brown, earthy to dull luster, visibly granular, with iron-oxide staining and possible feldspar-rich patches. No obvious cleavage; porous and commonly breaks along bedding or weak cement zones.

Identified September 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized sediment accumulated, compacted, and cemented by silica, calcite, or iron oxides; the rusty color indicates oxidation. Exact geological age cannot be determined from the photograph and may range from Paleozoic to Cenozoic depending on locality.

Uses & applications

Used as building stone, paving, aggregate, and occasionally architectural facing; attractive fine-grained varieties are collected or cut as decorative stone. This weathered specimen has little commercial value.

Geological facts

The block appears heavily weathered and coated with soil or iron oxides, obscuring original grain size and sedimentary structures. Dark fragments around it may be unrelated rock or construction debris.

Field identification & locations

Identify sandstone by its sandpaper-like texture, individual grains, porosity, and tendency to scratch glass only if quartz-rich; a dilute acid test can reveal carbonate cement. Common worldwide in former rivers, beaches, deserts, and sedimentary basins.