sedimentary

Sandstone (Red Sandstone)

Arenite (SiO2 based with Fe2O3 staining)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: Red, reddish-brown, or orange due to iron oxide (hematite) coating. Luster: Dull to earthy. Crystal structure: Clastic texture with visible sand grains. Cleavage: None. Specific Gravity: 2.2 - 2.8.

Luster: Dull to earthy

Identified June 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The red color suggests deposition in an oxidizing environment, such as a desert or river floodplain. These are often of Paleozoic or Mesozoic age.

Uses & applications

Commonly used as a building material, decorative stone, for domestic flagstones, and in the manufacturing of glass or grinding stones.

Geological facts

Red sandstone is a major component of iconic landforms like the Grand Canyon and the 'Red Rocks' of Sedona, Arizona. It provides significant insights into ancient wind patterns and sea level changes.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible layers or cross-bedding. Commonly found in arid regions, coastal areas, and near ancient riverbeds. To confirm, check if it scratches glass (indicating quartz content).