The energy that flows up from the root chakra to the crown spirals up weaving in and out of the chakras. The channels it makes as it rises are called nadi and look just like snakes.
The dormant kundalini energy found at the root chakra is said to be like a snake coiled sleeping ready to rise. The facetted stones from the root chakra up are; garnet, carnelian, citrine, peridot, blue topaz, iolte and amethyst.