Corundum is a crystalline form. This crystalline form is made up of aluminium oxide.
Corundum.
Corundum ( (Al_2O_3) ) is hexagonal in crystal structure.
Corundum is in the trigonal crystal system.
Corundum is used for jewlery
Red corundum is called ruby.
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.
According to the Mohs scale of mineral hardness, quartz (7) will not scratch any mineral with a higher number on the scale. Corundum is listed at 9. Therefore quartz will not scratch corundum, but corundum can scratch quartz.
Oh, dude, the best slogan for corundum would be "Corundum: Hard as a Rock, Pretty as a Gem." I mean, it's technically correct, right? Like, corundum is one tough mineral, but it's also used in jewelry because it can be super sparkly and beautiful. So, yeah, that slogan totally works.
Corundum is a mineral, therefore it could not be the hardest rock.