Inside the 40 m (130 ft) high Amarnath cave, the stalagmite is formed due to freezing of water drops that fall from the roof of the cave on to the floor and grows up vertically from the cave floor. It is considered to be a Shiva Linga by Hindus. The Cave waxes during May to August, as snow melts in the Himalayas above the cave and the resultant water seeps into the rocks that form the cave and gradually wanes thereafter. As per the religious beliefs, it has been claimed that the lingam grows and shrinks with the phases of the moon reaching its height during the summer festival, although there is no scientific evidence for this belief.
According to a Hindu legend, this is the cave where Shiva explained the secret of life and eternity to his divine consort, Parvati. Two other ice formations represent Parvati and Shiva's son, Ganesha.