Selenite is a form of gypsum with an obvious crystalline structure. Its soft light provides clarity of mind and expands one's awareness of self. It is also effective at clearing congested energies or negativity from one's field and is ideal for meditation and spiritual work as it enhances telepathy.
Beautiful and useful too! Pendulums are used much the same way as applied kinesiology or muscle testing to help determine the answer to a question.
Pendulum chain not shown in photo.