sedimentary
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
Hardness: 6-7 (Mohs scale) if quartz-based. Color: Tan, brown, or reddish-brown due to iron oxidation. Luster: Dull/Earthy. Structure: Clastic, fine to medium-grained. Cleavage: None.
- Hardness
- 6-7 (Mohs scale) if quartz-based
- Color
- Tan, brown, or reddish-brown due to iron oxidation
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale) if quartz-based. Color: Tan, brown, or reddish-brown due to iron oxidation. Luster: Dull/Earthy. Structure: Clastic, fine to medium-grained. Cleavage: None.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral particles or rock fragments. The reddish tint suggests it was formed in an oxygen-rich environment where iron-containing minerals oxidized.
Uses & applications
Used in construction, as a decorative stone, or as an abrasive. In historical contexts, it is a primary material for architecture and sculpture.
Geological facts
Sandstone accounts for about 20-25% of all sedimentary rocks. Famous structures like the treasury at Petra and the Red Fort in India are carved from or built with sandstone.
Field identification & locations
Identify by a 'sandpaper' feel; if you rub it, small grains may come loose. It often shows layering or bedding planes. Common in deserts, riverbeds, and coastal areas.
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