sedimentary
Sandstone (likely Red/Brown Sandstone)
Arenite (SiO2 based)
Hardness: 6-7 on Mohs scale (depending on cementation); Color: Tan, brown, reddish-brown; Luster: Dull or earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale (depending on cementation)
- Color
- Tan, brown, reddish-brown
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 on Mohs scale (depending on cementation); Color: Tan, brown, reddish-brown; Luster: Dull or earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. Often formed in desert, river, or coastal environments over millions of years.
Uses & applications
Widely used in construction for flagstone, paving, and building facades. Also used as a primary source of silica for glass manufacturing and as abrasive material.
Geological facts
Sandstone makes up about 10-20% of the Earth's total sedimentary rock. It is a major reservoir for groundwater and oil/gas fields due to its high porosity.
Field identification & locations
Identify in the field by its gritty 'sandpaper' texture. Common in arid regions and canyonlands. Collectors look for unique banding patterns (Liesegang rings) or fossil inclusions.
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