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basalt rock grinding stone

Basalt Rock Grinding Stone

fact sheet aboriginal grinding stones,grinding stones are usually made from abrasive rocks such as sandstone or coarse-grained basalt or quartzite the stones are sometimes found upside down, with the grinding surface facing the ground to preserve it from the weather. upper and lower grinding stones will not necessarily be found together.basalt crushing and mining equipment,basalt are extrusive rock , volcanic eruption more relevant in the magma flow process, cooled and solidified to form , the main feature is a blowhole , rhyolite , etc., hard and tough . intrusive rocks belong , because there is no spray the surface, close to the surface in the ground, the movement is slow, slow decline in temperature , so crystalline clear , hard and brittle..

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