sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
Hardness: 6-7 (Mohs); Color: Tan, brown, and reddish-orange; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None
- Hardness
- 6-7 (Mohs)
- Color
- Tan, brown, and reddish-orange
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, brown, and reddish-orange; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None
Formation & geological history
Formed by the accumulation and cementation of mineral particles or rock fragments (clasts) of sand size. The reddish hues indicate the oxidation of iron-bearing minerals during or after deposition.
Uses & applications
Used in construction, as a building stone, in the manufacture of glass, and for landscaping. Common in many geological formations globally.
Geological facts
Sandstone is one of the most common types of sedimentary rock and is often used to map ancient environments, such as deserts or river beds. It can act as a natural aquifer for groundwater.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found in desert dunes, river deltas, and beaches. Collectors should look for unique layering or fossils within slabs.
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