sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 based with Fe2O3 banding)
Hardness: 6-7 (Mohs), Color: Tan to reddish-brown, Luster: Dull/Earthy, Grainy texture, displays iron oxide (limonite/hematite) banding, Porous structure.
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Physical properties
Hardness: 6-7 (Mohs), Color: Tan to reddish-brown, Luster: Dull/Earthy, Grainy texture, displays iron oxide (limonite/hematite) banding, Porous structure.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, primarily quartz. The dark banding is a result of iron-rich mineral deposition during diagenesis or groundwater movement.
Uses & applications
Commonly used in construction as building stone, pavers, and decorative landscaping. Also serves as a primary reservoir rock for oil, gas, and groundwater.
Geological facts
Sandstone makes up about 10-20% of the Earth's sedimentary rocks. The curved dark lines are often called Liesegang rings or chemical precipitate bands.
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel and visible grain structure. Look for bedding planes and chemical staining in riverbeds or outcrops.
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