Titanium Rainbow Quartz Cluster. To achieve this brilliant display of color, the Arkansas Quartz Crystals is treated with select minerals, such as titanium, etc. This is done via an electrostatic process whereby the crystals are put into a vacuum and charged opposite the select mineral. High Heat is applied. The select mineral is then put into the vacuum and it “clings” to the crystals. The crystals are then turned over and the process is repeated, so that all areas are covered. This treatment is a permanent and on the outside only.