sedimentary
Sandstone
Arenite
Hardness: 6-7 (Mohs scale), Color: tan, brown, or buff due to iron oxide, Luster: dull/earthy, Structure: clastic/granular texture with visible sand grains, Cleavage: none, SG: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, brown, or buff due to iron oxide, Luster: dull/earthy, Structure: clastic/granular texture with visible sand grains, Cleavage: none, SG: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized grains (0.0625 to 2 mm) by minerals like silica or calcite. Often found in ancient riverbeds, deserts, or coastal deposition environments.
Uses & applications
Primary use in construction as dimension stone, paving, and architectural facades. Also used in glass making and as a primary reservoir rock for oil and gas.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous Red Rocks Amphitheatre and many ancient structures like Petra are carved from sandstone.
Field identification & locations
Identify by its gritty, sandpaper-like texture and possible visible bedding layers. It is ubiquitous in sedimentary basins and mountain ranges worldwide. Collectors value specimens with unique erosion patterns or fossils.
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