sedimentary
Red Sandstone (Arkose)
Clastic Sedimentary Rock (Lithic Arkose)
Hardness: 6-7 (Mohs scale), Color: Pink/Reddish-brown, Luster: Dull/Earthy, Structure: Grainy with visible sand particles and some larger clasts, Cleavage: None (fractures across grains)
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Pink/Reddish-brown, Luster: Dull/Earthy, Structure: Grainy with visible sand particles and some larger clasts, Cleavage: None (fractures across grains)
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. The red color is typically due to iron oxide (hematite) staining the grains. These often form in terrestrial river or desert environments.
Uses & applications
Primarily used as a building material, masonry, and flagging stone. In some cases, it acts as an important reservoir for groundwater or petroleum.
Geological facts
Many of the famous 'Red Rocks' landmarks in the Western United States, such as those in Utah and Colorado, are composed of similar sandstone formations dating from the Permian or Triassic periods.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible bedding planes. Look for it in outcrops where layered strata are exposed. It is highly common and found globally.
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