sedimentary
Red Sandstone
Arenic rock (composed mainly of SiO2 with Fe2O3)
Hardness: 6-7 on Mohs scale; Color: Reddish-brown to maroon due to iron oxide; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Specific Gravity: 2.2-2.8.
- Hardness
- 6-7 on Mohs scale
- Color
- Reddish-brown to maroon due to iron oxide
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Reddish-brown to maroon due to iron oxide; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Specific Gravity: 2.2-2.8.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in desert or river bed environments. The red color suggests deposition in an oxygen-rich environment (oxidizing conditions) during the Paleozoic or Mesozoic eras.
Uses & applications
Commonly used as a building material, decorative stone in landscaping, and sometimes for artistic carvings or grindstones.
Geological facts
Red Sandstone is famous for creating the iconic landscapes of the American Southwest and the 'Old Red Sandstone' formations in Europe, which are key to understanding Earth's history.
Field identification & locations
Identify by its gritty, sand-like texture and distinct red coloring that does not rub off. Found in riverbeds, canyons, and sedimentary basins. It often shows cross-bedding or layering.
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