sedimentary
Red Sandstone
Arenite (primarily quartz with iron oxide cement)
Hardness: 6-7 (individual grains); Color: Reddish-brown to tan; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (individual grains)
- Color
- Reddish-brown to tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (individual grains); Color: Reddish-brown to tan; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in desert or river environments where iron oxidation provides the red hue.
Uses & applications
Extensively used in construction for building stone, paving, and monuments; also used in glass manufacturing if high in silica.
Geological facts
The famous red rock formations in Sedona, Arizona and Arches National Park are composed largely of variations of this rock type.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible layered bedding. Common in arid sedimentary basins. Collectors often look for unique erosion patterns or inclusions.
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