sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide)
Hardness: 6-7 (Mohs scale); Color: Red, reddish-brown; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Red, reddish-brown
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Red, reddish-brown; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Forms over millions of years through the accumulation and cementation of sand-sized mineral grains or rock fragments. The red color is usually due to the presence of iron oxide (hematite) in the cementation process.
Uses & applications
Widely used in construction for flagstones, tiles, and as a dimension stone for buildings. Also popular in landscaping and as a decorative stone.
Geological facts
Sandstone is one of the most common sedimentary rocks. The famous 'Red Rocks' of the American West and the ancient city of Petra are primarily composed of this material.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Often shows layering (bedding planes). Commonly found in desert environments or ancient river basins. Collectors look for unique banding or fossil inclusions.
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