sedimentary
Sandstone
Arenite (SiO2 primarily)
Hardness: 6-7 (Mohs scale), Color: Tan, orange, reddish-brown, Luster: Dull/Earthy, Texture: Clastic/Gritty like sandpaper, Cleavage: None
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Tan, orange, reddish-brown, Luster: Dull/Earthy, Texture: Clastic/Gritty like sandpaper, Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral particles (usually quartz or feldspar) in environments like deserts, river deltas, or beaches. This specimen shows water-worn rounding, likely from a river or coast.
Uses & applications
Construction material, glass manufacturing, architectural stone, and source of silica for industrial processes.
Geological facts
Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. The red and orange hues are typically caused by iron oxide (hematite or limonite) staining.
Field identification & locations
Identify by its gritty texture; it feels like sandpaper to the touch. It often shows visible layers or bedding planes. Found globally in areas where prehistoric water bodies or dunes existed.
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