sedimentary

Red Sandstone

Sandstone (mainly SiO2 with Iron Oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Reddish-brown/pink; Luster: Dull to earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None (interrupts across grains); Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Reddish-brown/pink
Luster: Dull to earthy

Identified March 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Reddish-brown/pink; Luster: Dull to earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None (interrupts across grains); Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The red color suggests deposition in an oxygen-rich environment (arid or continental) where iron minerals oxidized. Ages vary from Precambrian to modern.

Uses & applications

Commonly used in construction for flagstones, pavers, and building facades. Fine-grained varieties are used for whetstones and architectural carvings.

Geological facts

The vibrant red color is usually due to a thin coating of hematite around the quartz grains. Red sandstone formations create some of the world's most famous landscapes, such as the Grand Canyon and Petra.

Field identification & locations

Identify in the field by its 'sandpaper' texture and visible layering (bedding). It is frequently found in riverbeds, deserts, and coastal cliffs. Collectors look for unique ripples or trace fossils.