sedimentary
Red Sandstone
Arenite (SiO2 with Fe2O3)
Hardness: 6-7 (Mohs); Color: Reddish-brown to maroon; Luster: Dull, earthy; Crystal structure: Clastic texture; Granular feel like sandpaper.
- Hardness
- 6-7 (Mohs)
- Color
- Reddish-brown to maroon
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Reddish-brown to maroon; Luster: Dull, earthy; Crystal structure: Clastic texture; Granular feel like sandpaper.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. The red color is caused by the oxidation of iron minerals (hematite) during diagenesis in arid environments.
Uses & applications
Primary use in construction as a building stone or paving material. Fine specimens can be used for landscaping ornamental rocks or as abrasive material.
Geological facts
Red sandstone is famous for creating the iconic landscapes of the American Southwest, such as the Grand Canyon and Sedona's red rocks.
Field identification & locations
Identify by its gritty, abrasive texture and lack of visible layering in small cobbles. Commonly found in riverbeds, deserts, and ancient seafloors.
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Arenite (if sandstone)
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Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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Chert Breccia
Brecciated Chert (Microcrystalline Silica)
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Shale or Slaty Mudstone
Argillaceous sedimentary rock
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Sandstone
Arenite (primarily SiO2)
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