sedimentary
Sandstone
Arenite
Mohs hardness around 6-7 (depends on cement), reddish-brown color (due to iron oxides), dull luster, clastic texture with visible sand-sized grains.
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Physical properties
Mohs hardness around 6-7 (depends on cement), reddish-brown color (due to iron oxides), dull luster, clastic texture with visible sand-sized grains.
Formation & geological history
Formed by the accumulation and cementation of sand-sized clasts, typically in desert, river, or shallow marine environments. Age varies widely.
Uses & applications
Used extensively in construction, as dimension stone, and for paving. Historically used for making grindstones.
Geological facts
Red sandstones are famous for forming spectacular landscapes in places like the American Southwest (e.g., Monument Valley, Zion National Park).
Field identification & locations
Identified by its gritty, sandpaper-like texture and visible sand grains. Found worldwide in sedimentary basins.
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