Corundum: Use as a Gemstone, Abrasive, Refractory - GeologyCrushed corundum is processed to remove impurities and then screened to produce uniformly sized granules and powders. These are used for grinding media,.crushing of corrundum,GEOLOGICAL SURVEYCorundum (emery) in amphibolite at Chester, Mass..._. . Sapphire or corundum gems . ... in crushing, the corundum breaks up into regular rhombohedrons,.
crushing of corrundum