sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide impurities)
Hardness: 6-7 (Mohs scale), Color: tan, brown, reddish-orange (due to iron oxidation), Lustre: dull/earthy, Texture: clastic (sand-sized grains)
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, brown, reddish-orange (due to iron oxidation), Lustre: dull/earthy, Texture: clastic (sand-sized grains)
Formation & geological history
Formed by the accumulation and cementation of sand grains over millions of years, typically in desert, river, or coastal environments. The reddish coloring is caused by the oxidation of iron-rich minerals (hematite or limonite).
Uses & applications
Used in construction, as a building stone (ashlars), for paving, and as an abrasive in some industrial processes.
Geological facts
Sandstone can preserve fossilized footprints or ripple marks from ancient riverbeds. It is a major reservoir rock for groundwater and petroleum.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layering. It is commonly found in canyon lands and near ancient shorelines.
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