Natural shares the same basic chemical properties as opal. It is made of tiny spheres of silicon dioxide, which stack onto each other in a pyramid grid shape. This grid is what allows the cat's-eye effect to be displayed when the stone is cut into a high-domed cabochon. Opalite is a soft and subtle yet dynamic iridescent man-made glass resin composed primarily of the mineral dolomite fused with metal to produce an opalescent appearance.