The most typical type of crystalline alumina, α-aluminium oxide, is called corundum. When trace features enable it to be seem purple it is called ruby, but all other colorations fall underneath the designation sapphire. Corundum includes a trigonal Bravais lattice with a space team of R-3c (range 167 while in https://chelwoodd963loq3.dailyblogzz.com/profile