sedimentary

Tumbled sandstone pebble

Quartz-rich sandstone, composed mainly of SiO₂ grains cemented by silica, iron oxides, or clay

AI-generated identification · may be incorrect

Tan-orange, dull to earthy luster, fine-grained and rounded from abrasion; typically Mohs 6–7 for quartz grains but weaker overall, with no obvious cleavage. The visible layering/fractures and granular texture support sandstone rather than a crystalline mineral.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in ancient river, shoreline, dune, or desert environments; its exact geological age cannot be determined from the photograph. The smooth shape indicates natural water wear or tumbling.

Uses & applications

Used as building and paving stone, aggregate, landscaping material, and decorative rock; attractive pieces are collected but are generally low value.

Geological facts

Orange coloration commonly comes from hematite or limonite coatings on quartz grains. Sandstone may preserve ripple marks, cross-bedding, fossils, or ancient environmental clues.

Field identification & locations

Look for visible sand grains, porous texture, uneven cement, and sedimentary layering; vinegar generally produces no reaction unless carbonate cement is present. Common worldwide, especially in eroded riverbeds and desert regions.