sedimentary
Sandstone Pebbles
Arenite (primarily SiO2 with mineral cement)
Hardness: 6-7 (Mohs); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Tan, beige, or light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in desert, river, or coastal environments.
Uses & applications
Used widely in construction as a building material, in the glass industry if high in silica, and as a decorative stone in landscaping.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth. It often preserves fossils and ripple marks from ancient water currents, providing a 'snapshot' of prehistoric environments.
Field identification & locations
Identify by its gritty, sand-like texture and visible sand grains. It is often found in outcroppings, riverbeds, and as common gravel. It can be scratched with a steel file but not easily with a fingernail.
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