Selenite is a powerfully energetic crystal. This is one of the few crystals that does not require any cleansing and can actually be used to cleanse other stones. The first time I held a selenite wand my hand literally vibrated. 

Selenite can be used to cleanse your energy in the beginning and/or end of the day. I've used it to cure headaches, backaches and anxiety by laying with it for a few minutes on my head, back or chest.