sedimentary
Sandstone (Water-worn Cobble)
Arenite (SiO2 based)
Hardness: 6-7 (on Mohs scale); Color: Tan to reddish-brown; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Texture: Gritty like sandpaper.
- Hardness
- 6-7 (on Mohs scale)
- Color
- Tan to reddish-brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Tan to reddish-brown; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Texture: Gritty like sandpaper.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains (mostly quartz) in riverbeds, beaches, or deserts. This specific specimen has been rounded and smoothed by hydraulic action in a river or coastal environment.
Uses & applications
Commonly used in construction, as a building stone, for decorative landscaping (river rocks), and as an abrasive in industrial applications.
Geological facts
Sandstone preserves a history of the Earth's surface, often containing ripples from ancient water currents or cross-bedding from ancient sand dunes. It is also one of the most common reservoir rocks for groundwater and oil.
Field identification & locations
Identify in the field by its distinctive 'sandpaper' feel and visible grain structure. Commonly found in riverbeds, along coastlines, and in sedimentary basins worldwide.
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