A word about Selenite... It is able to trasmit light, energy and information. It is known as the "light bringer". Selenite (and apophyllite and citrine) are the only crystals strong enough to clear negative energies out of quartz crystals. Selenite is excellent in helping with clear thinking and to increase your awareness both when looking inward (meditation) and at the world around you. It is an excellent tool for visualization, meditation and working with the subconscious. A healer will use a selenite wand to assess the clients blockages which cause dis-ease. It is also helpful with back pain.
Crystal clusters are not only beautiful collecter's pieces but they are very helpful in energizing a room. They cleanse the energy in your environment, can offer protection and purification. Some clusters can also be used to cleanse and energize other crystals.