sedimentary

Likely weathered sandstone fragment

Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Tan-brown, dull to earthy luster, visibly fine granular texture, and irregular fracture; likely Mohs hardness about 6–7 for grains but weakly cemented overall. No clear crystal faces or cleavage are visible.

Identified August 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized sediment was compacted and cemented, commonly in rivers, deserts, beaches, or shallow marine environments; its age cannot be determined from the photograph.

Uses & applications

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

Geological facts

The rusty-brown color commonly results from hematite or other iron oxides coating the grains. A hand lens may reveal rounded or angular quartz grains and bedding-related layering.

Field identification & locations

Likely sandstone, though weathered siltstone or an earthenware fragment cannot be excluded from the image alone. Test for gritty grains, lack of reaction to dilute hydrochloric acid, and scratching glass; common sources include sedimentary basins worldwide.