Salt crystal lamp is simply known as salt lamp also! It is made from salt crystal rocks formed by nature over hundreds of millions of years ago. When mining the salt crystals, explosives are strictly prohibited to preserve the structures of the crystals. Lamps are carefully crafted by hand to retain the unique, beautiful and natural shape of the rock. The result is a rare crystal with such beautiful colors ranging from off-white to apricot and warm pink. As the light bulb or a tea light warms up the lamp, healthful NEGATIVE IONS lift off from the surface and help to cleanse and improve the quality and freshness of the air you breathe.