sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
Hardness: 6.5-7 (Mohs); Color: Reddish-brown to pink; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6
- Color
- Reddish-brown to pink
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Reddish-brown to pink; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in desert or river environments. The red color is due to the oxidation of iron minerals (hematite).
Uses & applications
Widely used as a building material, decorative stone in landscaping, and in the manufacturing of grindstones or glass if high in silica content.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Famous landmarks like the Grand Canyon and the red rocks of Sedona are composed primarily of these stones.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins and coastal areas. Collectors value it for its layering and color variations.
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