Black obsidian is often associated with mystery and has a very strong ability to absorb. For this reason it is used often in feng shui, spiritual connection and protection. It is also known as a spiritual cleanser because of its ability to absorb psychic smog and help to see things more clearly.
Tigereye is said to combine earth energy with light or sun energy, creating an intense stone that's also well-grounded. Tigereye is said to enhance psychic and empathic energies, while protecting its wearer with an unblinking eye.