sedimentary

Red Sandstone Pebble

Arenite with iron oxide (Hematite)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: reddish-brown to terracotta; Luster: dull to earthy; Structure: clastic/granular; Cleavage: none; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: reddish-brown to terracotta
Luster: dull to earthy

Identified July 5, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: reddish-brown to terracotta; Luster: dull to earthy; Structure: clastic/granular; 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 reddish hue is caused by iron oxide staining (Hematite). This specific specimen appears water-worn, likely found in a riverbed or coastal area.

Uses & applications

Commonly used as construction aggregate, source of sand, decorative landscaping stone, and historically as a building material for monuments and cathedrals.

Geological facts

Sandstone makes up about 10-20% of the Earth's crustal sedimentary rocks. The famous 'Red Rocks' of the American Southwest are composed of similar iron-rich sandstones.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Often found in riverbeds, canyons, or coastal beaches. Collectors value specimens with unique erosion patterns or stripes.