Corundum has some electrical uses, and non gem quality material, such as emery, is extensively used as an abrasive because of its high hardness.
Corundum.
Pure corundum is clear in color.
Corundum is in the trigonal crystal system.
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 !
Ruby is the common name for the reddish variety of the mineral corundum. Blue corundum is called sapphire.
Corundum has some electrical uses, and non gem quality material, such as emery, is extensively used as an abrasive because of its high hardness.
Corundum.
Corundum is not magnetic.
Corundum ( (Al_2O_3) ) is hexagonal in crystal structure.
Corundum is used for jewlery
Red corundum is called ruby.
Corundum is aluminium oxide, Al2O3.
Pure corundum is clear in color.
Corundum is in the trigonal crystal system.
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.