Corundum is in the trigonal crystal system.
Pure corundum is clear in color.
Diamond is the hardest mineral and is the only one that can scratch corundum. but in my opinion corundum will scratch corundum any mineral of the same hardness will scratch the other !
Corundum is only aluminium oxide - Al2O3.
Corundum is used as an abrasive powder to polish lenses.
Corundum is not magnetic.
Corundum ( (Al_2O_3) ) is hexagonal in crystal structure.
Corundum is used for jewlery
Corundum is in the trigonal crystal system.
Red corundum is called ruby.
Pure corundum is clear in color.
Corundum is aluminium oxide, Al2O3.
Diamond is the hardest mineral and is the only one that can scratch corundum. but in my opinion corundum will scratch corundum any mineral of the same hardness will scratch the other !
Red corundum is called ruby.
100% of rubies are corundum. "Ruby" is a name made up by the gem trade for the mineral known as corundum, when it is red.
Corundum's luster is metallic.
Corundum can be used for sandpaper,jewelry,grinding wheels,etc.