sedimentary

Rounded sandstone pebble

Sandstone, predominantly quartz (SiO₂) grains cemented by silica, calcite, or iron oxides

AI-generated identification · may be incorrect

Likely Mohs hardness 6–7 for quartz-rich grains, with a pale tan color, dull earthy luster, porous granular texture, and no obvious cleavage; its smooth shape indicates abrasion or tumbling.

Identified September 16, 2026More sedimentary →

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Physical properties

Likely Mohs hardness 6–7 for quartz-rich grains, with a pale tan color, dull earthy luster, porous granular texture, and no obvious cleavage; its smooth shape indicates abrasion or tumbling.

Formation & geological history

Formed when sand was compacted and cemented into sandstone, then weathered and rounded by water or sediment transport. The specimen’s precise age and source cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and decorative material; this small rounded piece has mainly educational or casual collecting value.

Geological facts

Visible pores and an uneven, grainy surface distinguish it from most polished minerals. The apparent spherical shape may also reflect deliberate tumbling or shaping rather than natural transport alone.

Field identification & locations

Look for clearly visible sand grains, layered texture, and a scratch resistance near quartz; dilute acid may fizz if calcite cement is present. Sandstone occurs worldwide, especially in riverbeds, deserts, and sedimentary basins.