sedimentary
Red Sandstone
Clastic sedimentary rock (primarily Quartz with Hematite)
Hardness: 6-7 (Mohs scale); Color: Red/Brownish-red; Luster: Dull/Matte; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Red/Brownish-red
- Luster
- Dull/Matte
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Red/Brownish-red; Luster: Dull/Matte; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized minerals or rock grains. The red color indicates the presence of iron oxide (hematite) and suggests an arid environment during deposition.
Uses & applications
Used extensively in construction as a building stone and for decorative paving. Small pebbles are often used in landscaping or as aquarium decor.
Geological facts
The famous Red Rocks Amphitheatre and many iconic formations in the American Southwest are composed of this rock. Its color captures the oxidation states of ancient earth surface environments.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and its visible distinct sand grains. Commonly found in riverbeds, deserts, and coastal cliffs.
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