sedimentary

Weathered sandstone or arkosic sandstone

Clastic sandstone, likely quartz–feldspar-rich (arkose)

AI-generated identification · may be incorrect

Granular, tan-brown, dull to slightly earthy luster, with visible sand-sized grains and minor dark lithic fragments; typical hardness is about 6–7 for quartz grains, though the rock is weaker overall. No obvious cleavage; pores and rough weathered surfaces are characteristic.

Identified September 5, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented by silica, iron oxides, or calcite; its exact geologic age cannot be determined from the photograph. Weathering has rounded and darkened the surface.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally decorative material; this ordinary hand specimen has little commercial or jewelry value.

Geological facts

The rusty coloration commonly reflects iron-oxide cement or staining. Arkose specifically indicates abundant feldspar and often relatively rapid erosion of nearby granitic rocks.

Field identification & locations

Identify by its gritty texture, visible sand grains, and lack of interlocking crystalline fabric; a glass-scratch test may show quartz-rich grains, but acid testing and a hand lens improve identification. Sandstone occurs widely in sedimentary basins worldwide.