sedimentary

Weathered sandstone slab

Quartz-rich sandstone; exact composition cannot be confirmed from the image

AI-generated identification · may be incorrect

Brown, fine-grained, matte surface with pale veins or mineral-filled fractures; sandstone is typically Mohs 6–7 if quartz-rich, with no visible crystal structure or cleavage. Grain size and hardness cannot be established from the photo.

Identified October 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Sandstone forms when deposited sand is compacted and cemented, commonly in river, desert, or shoreline settings; its age is unknown from the image.

Uses & applications

Used as building and paving stone, landscaping material, and occasionally as a decorative or collectible specimen.

Geological facts

The light-colored lines may be quartz or calcite filling cracks, though visual inspection alone cannot identify them reliably.

Field identification & locations

Look for sand-sized grains and a gritty texture; common worldwide in sedimentary basins. The pictured slab’s identity is provisional without close-up inspection or tests.