River pebble is generally found in sand hills which are formed through the rise of ancient riverbed which are experiencing crustal movement for eons. The sand hills, shocked by mountain torrents and transported by water, witness extrusion and friction. During the course of tens of thousands of years’ evolution, the surface becomes smooth since its irregular edges are lost due to collision and friction. The average content of SiO2 is 85%, maximum compression strength more than 300 M Pa, and hardness more than degree 7 according to Moh'shardness. Owing to its properties of anti-compression, anti-abrasion and anti-erosion, it is ideal raw material for mechanical sand.
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