sedimentary
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: tan to reddish-brown, Luster: dull/earthy, Texture: granular and abrasive, Structure: massive or bedded, Cleavage: none
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan to reddish-brown, Luster: dull/earthy, Texture: granular and abrasive, Structure: massive or bedded, Cleavage: none
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specific rounded specimen (cobble) has been smoothed by water transport in a river or coastal environment.
Uses & applications
Commonly used as construction aggregate, paving material, and in glass manufacturing if the quartz purity is high.
Geological facts
Sandstone acts as a natural aquifer, often holding large quantities of groundwater or petroleum due to its porosity.
Field identification & locations
Identify by its 'sandpaper' feel and visible grains. It is extremely common in riverbeds and mountainous regions across the globe.
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