sedimentary

Tan sandstone

Quartz-rich clastic sedimentary rock (sandstone; composition cannot be confirmed from the image)

AI-generated identification · may be incorrect

Tan, rough, dull to slightly sparkly surface; likely composed mainly of quartz grains with possible feldspar and cement. Hardness varies with cement, commonly around 6–7 for quartz grains; grain size and bedding are not clear in the photo.

Identified October 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized grains accumulated, compacted, and cemented; its age and depositional setting cannot be determined visually.

Uses & applications

Commonly used as building and paving stone, and as a source of aggregate; this small specimen is mainly suitable for collecting or display.

Geological facts

Sandstone’s appearance and durability depend strongly on grain composition and the cement binding the grains.

Field identification & locations

Look for visible sand grains and a granular, sometimes gritty texture; sandstone occurs widely in sedimentary basins worldwide. Approximate value: $1–$10 for an ordinary hand-sized specimen.