sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs scale); Color: tan, buff, or light brown; Luster: dull to earthy; Structure: granular, clastic texture with visible sand grains; Cleavage: none; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- tan, buff, or light brown
- Luster
- dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: tan, buff, or light brown; Luster: dull to earthy; Structure: granular, clastic texture with visible sand grains; Cleavage: none; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral grains or rock fragments, typically sand-sized. This specimen is water-worn, likely from a riverbed or coastal environment where transport rounded its edges.
Uses & applications
Used extensively in construction for building stone, paving, and as an aggregate. High-purity quartz sandstone is used in glass manufacturing and industrial filtration.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. It is a major reservoir rock for groundwater, oil, and natural gas due to its porosity.
Field identification & locations
Identify by its gritty feel (like sandpaper) and the presence of visible sand grains. Commonly found in riverbeds, canyons, and ancient desert deposits. Collectors value specimens with unique erosion patterns or fossils.
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