sedimentary

Weathered sandstone fragment

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

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains, tan to brown, dull to slightly gritty, porous, and non-cleavable; visible sand-sized grains and possible bedding are diagnostic.

Identified August 15, 2026More sedimentary →

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Physical properties

Typically Mohs hardness 6–7 for quartz grains, tan to brown, dull to slightly gritty, porous, and non-cleavable; visible sand-sized grains and possible bedding are diagnostic.

Formation & geological history

Forms when sand is compacted and cemented in rivers, beaches, deserts, or shallow-marine basins; individual specimens may range from Precambrian to modern geological ages.

Uses & applications

Used as building stone, paving, aggregate, and decorative stone; small fragments have modest educational or collecting value.

Geological facts

Iron oxides commonly create the tan, rust, or reddish coloration. The pictured piece appears naturally weathered and broken, though its small size limits confident identification.

Field identification & locations

Common worldwide, especially in sedimentary basins; distinguish it from shale by its gritty texture and from quartzite by its weaker, more porous fabric. A hand lens, scratch test, and dilute acid test can help confirm it.