sedimentary
Red Sandstone
Sandstone (hematitic/iron-rich quartzite or arenite)
Hardness: 6-7 on the Mohs scale depending on cementation; Color: reddish-brown, maroon, dark pink-red; Luster: dull to earthy, slightly sugary visual texture; Grain size: medium to fine quartz grains bound by silica or iron oxide cement.
- Hardness
- 6-7 on the Mohs scale depending on cementation
- Color
- reddish-brown, maroon, dark pink-red
- Luster
- dull to earthy, slightly sugary visual texture
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Physical properties
Hardness: 6-7 on the Mohs scale depending on cementation; Color: reddish-brown, maroon, dark pink-red; Luster: dull to earthy, slightly sugary visual texture; Grain size: medium to fine quartz grains bound by silica or iron oxide cement.
Formation & geological history
Formed through the compaction and cementation of sand-sized grains, primarily quartz, in arid desert, riverbed, or delta environments where iron oxide (hematite) coated the grains to give it a distinct reddish color.
Uses & applications
Widely used as building stone, flagstone, paving material, and decorative landscaping rock.
Geological facts
Red sandstone is responsible for famous geological features around the world, such as the red rock formations in Sedona, Arizona, and the ancient city of Petra in Jordan.
Field identification & locations
Identify in the field by its distinct sand-like texture (feeling like fine sandpaper) and reddish-brown iron oxide coloration. Found abundantly worldwide in sedimentary basin regions.
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