sedimentary
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale), Color: tan with red/purple iron oxide banding, Luster: dull to earthy, Texture: clastic/granular (sand-sized grains), No cleavage, Porosity can be high.
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan with red/purple iron oxide banding, Luster: dull to earthy, Texture: clastic/granular (sand-sized grains), No cleavage, Porosity can be high.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in deserts, riverbeds, or coastal environments. The reddish-purple staining indicates oxidation of iron minerals (hematite/goethite) within the rock matrix.
Uses & applications
Used widely as a construction material, dimension stone for masonry, paving, and occasionally for artistic sculpture and home landscaping.
Geological facts
Sandstone acts as a natural aquifer, filtering water and storing oil and gas due to its porous nature. The distinctive banding seen here is often referred to as Liesegang rings or iron-staining.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layering or banding. Commonly found in large sedimentary basins and outcrops worldwide.
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