sedimentary
Red Sandstone
Sandstone (principally Quartz, SiO2, with Iron Oxide hematite cement)
Hardness: 6-7 on Mohs scale (quartz grains); Color: reddish-brown to terracotta brick red; Luster: dull, earthy; Texture: medium-grained, rough grit feel; Structure: clastic sedimentary.
- Hardness
- 6-7 on Mohs scale (quartz grains)
- Color
- reddish-brown to terracotta brick red
- Luster
- dull, earthy
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Physical properties
Hardness: 6-7 on Mohs scale (quartz grains); Color: reddish-brown to terracotta brick red; Luster: dull, earthy; Texture: medium-grained, rough grit feel; Structure: clastic sedimentary.
Formation & geological history
Formed from the accumulation and cementation of sand-sized grains, typically in desert dune environments, alluvial fans, or river beds. The characteristic red color comes from iron oxide (hematite) coating the sand grains.
Uses & applications
Widely used as a building material, paving stone, decorative landscaping rock, and in masonry.
Geological facts
Red sandstone formed during the Permian and Triassic periods creates iconic landforms worldwide, such as the famous red rock formations in Sedona, Arizona, and Zion National Park in Utah.
Field identification & locations
Easily identified by its reddish color and gritty sandpaper feel when rubbed. Very common in arid and ancient desert regions.
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