sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Red-brown to tan; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None/Grainy

Hardness: 6-7 (Mohs)
Color: Red-brown to tan
Luster: Dull/Earthy

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Red-brown to tan; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None/Grainy

Formation & geological history

Formed through the accumulation and litification of sand-sized mineral particles, frequently quartz or feldspar, often in desert or riverbed environments. Its color comes from iron oxide (hematite/limonite) acting as a binding agent.

Uses & applications

Used widely as a building material, in landscaping, and sometimes for glass manufacturing if silica content is exceptionally high.

Geological facts

Red sandstone is famous for creating the landscape of the American Southwest, such as the Grand Canyon. It is often porous and serves as an important aquifer for groundwater.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grain layers. Common in outcrops, riverbeds, and arid regions. Collectors look for unique color banding (Wonderstone).