sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, primarily SiO₂ grains cemented by silica, iron oxides, or clay

AI-generated identification · may be incorrect

Tan, granular, and dull to slightly earthy; likely Mohs 6–7 for quartz grains, though weak cement makes the fragment friable. No visible crystals or cleavage; specific gravity commonly about 2.2–2.7.

Identified August 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted and cemented sand deposited in rivers, beaches, dunes, or shallow marine settings; its precise geological age cannot be determined from the photograph.

Uses & applications

Used as building stone, paving, aggregate, and occasionally as a decorative stone; this small weathered fragment has negligible commercial value.

Geological facts

The rusty tan color commonly comes from iron-oxide staining. Sandstone may preserve ripple marks, cross-bedding, fossils, or rounded quartz grains.

Field identification & locations

Identify it by visible sand-sized grains, gritty texture, layered or porous structure, and lack of glassy crystal faces; common worldwide, especially in sedimentary basins. A hand lens and vinegar test can help distinguish carbonate cement from siliceous sandstone.