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 !
Corundum is only aluminium oxide - Al2O3.
Corundum is used as an abrasive powder to polish lenses.
Corundum is not magnetic.
Corundum is used for jewlery
Corundum ( (Al_2O_3) ) is hexagonal in crystal structure.
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.
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.
The value of the mineral corundum will vary according to its appearance. Gem quality corundum is highly valued. Non gem quality corundum has many industrial uses and is much less highly valued.
Corundum is a mineral, therefore it could not be the hardest rock.