sedimentary
Red Sandstone
Arenite (specifically Quartz Arenite with Iron Oxide)
Hardness: 6-7 on Mohs scale; Color: Reddish-brown, dull to earthy luster; Texture: Clastic, medium-grained like sandpaper; Composition: Primarily quartz sand with hematite cementation.
- Hardness
- 6-7 on Mohs scale
- Color
- Reddish-brown, dull to earthy luster
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Reddish-brown, dull to earthy luster; Texture: Clastic, medium-grained like sandpaper; Composition: Primarily quartz sand with hematite cementation.
Formation & geological history
Formed by the accumulation of sand-sized grains deposited by water, ice, or wind, subsequently lithified over millions of years. Red color indicates deposition in oxidising environments (terrestrial).
Uses & applications
Extensively used in construction for flagstone, building facades, and decorative landscaping. Historically used for monuments and temples.
Geological facts
The red color is caused by the presence of iron oxide (rust) coating the quartz grains. Famous examples include the Red Rocks Amphitheatre in Colorado and the Grand Canyon.
Field identification & locations
Identify in the field by its sandpaper-like feel and visible layering (bedding). Commonly found in arid, desert, or ancient riverbed regions.
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