These stunning oil/tart/wax burners are made out of original Himalayan salt and are designed to hold a tealight. These burners are a beautiful alternative to man-made ionisers, without any noise and with no harmful side effects. Salt crystal lamps are made from original salt crystal rocks, formed over hundreds of millions of years and mined over 800 feet under the foothills of the Himalayas. As the lamp warms up, healthy negative ions lift off from the surface to help cleanse and improve the quality and freshness of the air you breathe. Negative ions are odourless and tasteless molecules that occur in certain environments, such as mountains, near waterfalls and beaches.