sedimentary
Sandstone (Red/Brown)
Arenite (composed primarily of SiO2)
Hardness: 6-7 (Mohs scale), Color: Brownish-red to tan, Luster: Dull/Earthy, Crystal structure: Clastic (grains), Cleavage: None, Specific gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Brownish-red to tan, Luster: Dull/Earthy, Crystal structure: Clastic (grains), 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, typically in desert, river, or coastal environments over millions of years.
Uses & applications
Used widely in construction as a building stone, in glass manufacturing if high in silica, and for aesthetic landscaping or decorative carvings.
Geological facts
Sandstone preserves records of ancient environments, often showing cross-bedding from ancient dunes or ripples from prehistoric water currents.
Field identification & locations
Identify by its gritty, sandpaper-like texture and visible grains. Commonly found in sedimentary basins and arid regions globally.
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