sedimentary

Rounded reddish sandstone pebble

Quartz-rich sandstone, likely ferruginous arkose or litharenite

AI-generated identification · may be incorrect

Typically Mohs 6–7 because of quartz; salmon-pink to reddish, dull to slightly sandy luster, fine-grained and non-cleavable. The rounded shape and visible pale vein or fracture suggest natural stream or beach wear.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Cemented sand grains accumulated in an ancient river, floodplain, dune, or shallow-marine setting, then lithified; iron oxides produce the red color. Its exact geological age cannot be determined from the image.

Uses & applications

Used mainly as a decorative or collecting stone; sandstone is widely used for building stone, paving, masonry, and aggregate. This individual pebble has little commercial value.

Geological facts

The coloration commonly comes from hematite or limonite coatings on quartz and feldspar grains. Rounding indicates transport and abrasion by flowing water, waves, or glacial movement.

Field identification & locations

Look for visible sand grains, layered texture, a gritty feel, and weak reaction to dilute acid; it is softer and more porous than quartzite. Common in streambeds, beaches, and sandstone-rich landscapes.