Selenite vibrates to a very high frequency, and for this reason, is an extremely powerful light working tool which can clear, open, and activate the Crown and Higher Chakras and is excellent for all types of spiritual work. Selenite is exceptionally energetic and versatile, making it an outstanding tool for use in all types of crystal work. Selenite does not ever need to be cleared. It is self-clearing, and self-charging. 
 
It is also important to note that  Selenite should never be placed in or near liquid, as it is water-soluble, and will dissolve over time.
 
You will be sent a tower at random.