sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement, SiO2 with Fe2O3)
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale; reddish-brown to terracotta color; dull, earthy luster; granular, gritty texture.
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Physical properties
Hardness 6-7 on Mohs scale; reddish-brown to terracotta color; dull, earthy luster; granular, gritty texture.
Formation & geological history
Formed by the compaction and iron-oxide cementation of mineral sand grains deposited in ancient desert dunes or fluvial environments.
Uses & applications
Widely used as an architectural building stone, paving flagstone, and crushed aggregate for construction.
Geological facts
Its red coloration is due to small amounts of iron oxide (hematite) coating individual quartz grains, mimicking the iconic colors of the American Southwest.
Field identification & locations
Identified in the field by its distinct sandpaper-like feel and visible granular clasts; found globally in continental sedimentary basins.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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