sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
Hardness: 6-7 (Mohs scale); Color: Cream, tan, with orange/brown iron oxidization; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Cream, tan, with orange/brown iron oxidization
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Cream, tan, with orange/brown iron oxidization; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of mineral particles or rock fragments (sand) in marine or terrestrial environments. Typically ranges from hundreds of thousands to hundreds of millions of years old.
Uses & applications
Used primarily as a construction material, for paving, in the manufacturing of glass, and as a decorative garden stone.
Geological facts
Sandstone accounts for approximately 10-20% of all sedimentary rocks on Earth. The iron staining (orange color) suggests exposure to oxygen and water during or after the lithification process.
Field identification & locations
Identify by its gritty, sand-like texture and visible layers or banding. It is extremely common in desert regions and near ancient riverbeds. For collectors, look for unique color patterns often called 'Picture Sandstone'.
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