sedimentary
Red Sandstone
Arenite (with Iron Oxide)
Hardness: 6-7 (Mohs scale), Color: Reddish-brown to pink, Luster: Dull/Earthy, Crystal Structure: Clastic grainy texture, Cleavage: None, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Reddish-brown to pink, Luster: Dull/Earthy, Crystal Structure: Clastic grainy texture, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cemented lithification of sand-sized mineral particles or rock fragments. The red color is due to the presence of iron oxide (hematite) during the deposition in terrestrial or shallow marine environments.
Uses & applications
Commonly used as a building material, paving stone, and in landscaping. Polished varieties are sometimes used in decorative ornaments.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous red rock formations in Sedona, Arizona, and the Grand Canyon are primarily composed of red sandstone layers.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Often found in riverbeds, canyons, and desert regions. Collectors look for unique banding or weathering patterns.
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Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
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Sandstone
Arenite (primarily SiO2)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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