sedimentary

Red Sandstone

Arenite (primarily Quartz with Iron Oxide)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Red, reddish-brown; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Red, reddish-brown
Luster: Dull to earthy

Identified May 3, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Red, reddish-brown; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Forms over millions of years through the accumulation and cementation of sand-sized mineral grains or rock fragments. The red color is usually due to the presence of iron oxide (hematite) in the cementation process.

Uses & applications

Widely used in construction for flagstones, tiles, and as a dimension stone for buildings. Also popular in landscaping and as a decorative stone.

Geological facts

Sandstone is one of the most common sedimentary rocks. The famous 'Red Rocks' of the American West and the ancient city of Petra are primarily composed of this material.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Often shows layering (bedding planes). Commonly found in desert environments or ancient river basins. Collectors look for unique banding or fossil inclusions.