sedimentary

Red Sandstone

Clastic Sedimentary Rock (typically contains Quartz and Iron Oxide)

AI-generated identification · may be incorrect

Hardness: 6-7 (on Mohs scale); Color: Rusty red, orange, or reddish-brown; Luster: Dull or earthy; Crystal Structure: Clastic (grainy texture); Cleavage: None (fractures across grains); Specific Gravity: 2.2-2.8

Hardness: 6-7 (on Mohs scale)
Color: Rusty red, orange, or reddish-brown
Luster: Dull or earthy

Identified July 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral particles or rock fragments. The red color is usually due to the presence of iron oxide (hematite) coating the grains, indicating formation in an oxygen-rich environment such as a desert or riverbed.

Uses & applications

Widely used as a construction material (building stone, paving), in decorative landscaping, and as a source of industrial sand. Fine specimens are used in lithic art or as abrasives.

Geological facts

Red sandstone is a major component of famous geological formations like the Grand Canyon and the Red Rocks of Sedona. It is very porous and often acts as a significant aquifer for groundwater storage.

Field identification & locations

Identify in the field by its gritty 'sandpaper' feel and visible layers (bedding). It is commonly found in arid regions, ancient desert basins, and river deltas worldwide. Collectors look for unique banding or fossil inclusions.