Selenite is an extremely high vibrating crystal and will assist you in opening your crown chakra. It can also assist in connecting with your spirit guides and angels. Once the power of the selenite flows into the crown chakra, it will open, clear and activate the energy. The chakras will feel completely purified, and one should experience a liberated sense of self, free of negativity or inhibitions.
Another wonderful property of Selenite is that it has the power to cleanse and clear other crystals and negative energies. It never needs cleansing.
You can also use it to form a protective grid around the house, create a safe and quite space does not allow bad energy from outside into the space.