Crystal Rock Salt — Our crystal salt is mined at the foot of the Himalayas. These 200 million year old salt layers are high in minerals and trace elements, providing the highest quality of natural salt. weight: 5-6 lbs. height: 7-8" hardwood base 110V light fixture, switch and bulb Negative Ion Generator — When the rock salt crystal heats up, it emits negative ions. These ions cleanse the air by removing dust, pollen, dander, and cigarette smoke. They also offset the harmful radiation produced by computer monitors, TVs, and other electrical devices.