Himalayan Rock Salt Lamp Size: (Approx.) Diameter 15cm, Weight: 3.5kg Material: Himalayan Rock Salt Base: Wooden Origin: Himalayan Accessories: Cord with switch, light bulb This is a crystal of saltwater formed over 200 million years in the majestic Himalayan mountains. Rock salt has an air-purifying effect, but when illuminated by a light bulb, Himalayan rock salt emits negative ions into the air while emitting a slight heat, naturally improving your mood. Furthermore, salt has long been believed to have the power to protect people from impurities and things that have a negative impact on the human body.