Selenite is a stone that is capable of clearing all of your other crystals of negative energies. This stone helps to protect ones space of low vibrational energies and has a numerical vibration of the 8.
If you're into numerology then you know that the number 8 is a karmic number. This number relates to giving and receiving, the notion that one only gets back what it is that he or she puts out into the universe. If you want to invite positive outcomes into your life you must think positively and do positive deeds.