sedimentary

Sandstone

Quartz-rich clastic sandstone; exact variety cannot be determined from the image

AI-generated identification · may be incorrect

Coarse, gritty texture with visible sand-sized grains and a tan-gray color; likely dominated by quartz with feldspar and minor dark grains, cemented by silica, calcite, or iron oxides. Quartz has Mohs hardness 7; the rock has no regular crystal structure or cleavage and typically breaks unevenly.

Identified October 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was deposited, compacted, and cemented; sandstone ranges widely in age and may form in rivers, deserts, beaches, or shallow seas. The specimen’s age and setting cannot be identified from the image alone.

Uses & applications

Used as building and paving stone, crushed aggregate, and occasionally as a decorative or collectible specimen.

Geological facts

The visible grains suggest a clastic sedimentary rock, but the cement and precise composition require closer examination.

Field identification & locations

Look for distinct sand-sized grains that feel gritty and may be visible under magnification; acid testing or thin-section analysis can help identify carbonate cement. Common worldwide in sedimentary basins.