sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
Hardness: 6-7 (Mohs scale), Color: Reddish-brown/Brick red, Luster: Dull/Earthy, Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Reddish-brown/Brick red, Luster: Dull/Earthy, Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, cemented by iron oxides (hematite). Commonly found in ancient desert or river environments from the Paleozoic or Mesozoic eras.
Uses & applications
Used primarily in building construction as a dimension stone, decorative landscaping, and occasionally as a source of silica for industrial manufacturing.
Geological facts
The red color is caused by the oxidation of iron minerals, essentially making the rock 'rusted.' Famous landmarks like the Grand Canyon and the 'Red Rocks' of Sedona, Arizona are primarily composed of this type of stone.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and distinct red/orange rubbing that may come off on hands. It typically shows visible layering or cross-bedding from its original deposition environment.
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