sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: tan, buff, or light brown, Luster: dull/earthy, Crystal structure: granular clastic texture, Specific gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, buff, or light brown, Luster: dull/earthy, Crystal structure: granular clastic texture, Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, typically in river beds, deserts, or coastal environments. This specimen appears water-worn or tumbled.
Uses & applications
Used widely as a building material, in glass manufacturing (if high silica), and as a common landscaping stone.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. It often preserves ripple marks and cross-bedding from ancient environments.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grain structure. It is commonly found in sedimentary basins and along riverbanks or beaches.
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