HELPING THE OTHERS REALIZE THE ADVANTAGES OF POLISHING POWDER

The most common kind of crystalline alumina, α-aluminium oxide, is known as corundum. When trace things allow it to be show up red it is called ruby, but all other colorations fall beneath the designation sapphire. Corundum provides a trigonal Bravais lattice with a space group of R-3c (amount 167 from the International Tables).The toughness of al