sedimentary

Red Sandstone Pebble

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 staining)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains); Color: Reddish-brown to terracotta; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (individual grains)
Color: Reddish-brown to terracotta
Luster: Dull/Earthy

Identified March 29, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains); Color: Reddish-brown to terracotta; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The red color indicates oxidation of iron-bearing minerals (hematite) in terrestrial environments. These can date from the Paleozoic to Cenozoic eras.

Uses & applications

Used primarily in landscaping, construction (as aggregate), and occasionally as a decorative architectural stone or for making sharpening stones.

Geological facts

Famous red sandstone formations include the 'Red Rocks' of Colorado and the 'Old Red Sandstone' of Northern Europe. The red color is often a sign of 'red beds,' which indicate the sediment was deposited in an oxygen-rich, dry environment.

Field identification & locations

Identify by its gritty texture (like sandpaper) and reddish rub-off. Found globally in riverbeds, deserts, and coastal areas. Collectors look for unique shapes weathered by water erosion.