sedimentary
Sandstone
Arenite (SiO2 based)
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale; color is pale tan with reddish-brown iron oxide banding; luster is dull or earthy; granular texture with visible sand-sized grains; non-crystalline structure; specific gravity 2.2-2.8.
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Physical properties
Hardness 6-7 on Mohs scale; color is pale tan with reddish-brown iron oxide banding; luster is dull or earthy; granular texture with visible sand-sized grains; non-crystalline structure; specific gravity 2.2-2.8.
Formation & geological history
Formed through the accumulation and compaction of mineral particles (primarily quartz and feldspar) in environments such as deserts, river beds, or beaches. This specimen demonstrates 'Liesegang rings', which are secondary chemical precipitation patterns caused by iron-rich fluids.
Uses & applications
Commonly used as a building material, in road construction, as a source for glass-grade silica, and as a decorative stone in landscaping and aquariums.
Geological facts
Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. The rhythmic banding seen here is often mistaken for wood grain or fossilized material, but it is purely mineral in origin.
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel and ability to crumble slightly under heavy pressure. Often found in arid regions or along ancient shorelines and canyon walls.
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