The salt crystal originates in the Himalayan Mountains and each is slightly unique in appearance. The salt is mined out of ancient caves and carved to accept a bulb on the inside and a wood base is then added to the bottom. Many people believe in the therapeutic value of salt lamps. When lit, the salt gradually heats causing the trace minerals to release negative ions (the good ones) which “cleanse" the surrounding air of positive ions (the bad ones) created by computers and other electrical equipment. It can also aid in purifying the air from other impurities caused by pollution and cigarette smoke. The light from a glowing salt lamp is soft, gentle and relaxing making it the perfect way to add a touch of natural appeal to any setting and even makes a perfect de-ionizing night light.