sedimentary
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
Hardness: 6-7 (Mohs). Color: Tan to reddish-brown with dark iron/manganese oxidization. Luster: Dull/Earthy. Texture: Granular/Sand-like. Cleavage: None.
- Hardness
- 6-7 (Mohs)
- Color
- Tan to reddish-brown with dark iron/manganese oxidization
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs). Color: Tan to reddish-brown with dark iron/manganese oxidization. Luster: Dull/Earthy. Texture: Granular/Sand-like. Cleavage: None.
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments of sand size, typically in river, desert, or marine environments. The dark patches indicate secondary mineral staining by iron or manganese oxides.
Uses & applications
Commonly used as a building material, in the manufacture of glass (if pure quartz), and as an abrasive in industrial tools.
Geological facts
Sandstone makes up about 10-25% of the sedimentary rock on Earth. It is a major aquifer for ground water and a primary reservoir for petroleum deposits.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel and visible grains. Often displays bedding planes or cross-bedding. Look for it in arid regions or exposed cliff faces.
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