sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 dominated with Fe2O3)
Hardness: 6-7 (individual grains); Color: Reddish-brown to maroon; Luster: Dull/Earthy; Texture: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (individual grains)
- Color
- Reddish-brown to maroon
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (individual grains); Color: Reddish-brown to maroon; Luster: Dull/Earthy; Texture: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and lithification of sand-sized grains, typically in arid or river environments. The red color indicates the presence of iron oxide (hematite) coating the grains, reflecting oxygen-rich depositional conditions.
Uses & applications
Construction material, architectural stone, paving, and occasionally used in landscaping or as a source of industrial sand.
Geological facts
The famous red cliffs of the American Southwest and the 'Red Rocks' of Colorado are primarily composed of various red sandstone formations. It has been used for building some of the world's most iconic red-hued monuments.
Field identification & locations
Identified by its gritty sand-like texture and reddish staining that won't wash off. Commonly found in desert regions, ancient riverbeds, and sedimentary basins. Check for bedding planes or cross-bedding indicators.
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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