Rainbow Obsidian is a type of volcanic glass that is predominantly black, but when polished and exposed to light, it displays an iridescent rainbow-like sheen. This stone is known for its powerful grounding and protective properties. It helps to cleanse and release negative energy, while also providing a shield against negativity. Rainbow Obsidian can also be used to enhance meditation, promote inner peace and harmony, and stimulate creativity and joy. It is associated with the root chakra and can be used to balance and strengthen this energy center.