sedimentary
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
Hardness: 6-7 (Mohs scale), Color: tan, buff, or brownish-yellow, Luster: dull to earthy, Crystal structure: granular clastic texture, Cleavage: none, Specific gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, buff, or brownish-yellow, Luster: dull to earthy, Crystal structure: granular clastic texture, Cleavage: none, Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments (clasts). Often formed in river beds, deserts, or coastal environments over millions of years.
Uses & applications
Commonly used as a building material, in flagstone for paving, for making grindstones, or as an ornamental stone in landscaping.
Geological facts
Sandstone accounts for about 20% of all sedimentary rocks on Earth. Some of the most iconic landscapes in the world, like the Grand Canyon and Petra, are carved from sandstone.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layers or bedding. It is frequently found in arid regions, river valleys, and along ancient coastlines.
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