Selenite really is the “magic wand” of the crystal world!
Selenite is a gemstone that has the property of enhancing mental power. 
Also referred to as  among crystal connoisseurs, selenite is a white or clear stone known for its powerful healing and energizing properties. It's actually one of the few crystals  to be able to  and is , thus associating it with lunar cycles and the divine feminine.
For all its divine attributes, selenite is actually quite versatile.
Selenite is not only a useful tool for spiritual cleansing, but it can also provide the user with a greater sense of protection and clarity. It can be particularly helpful when you just feel stuck or tired for no reason to have it in your home, office, or sacred space, as its crystal helps to remove all energy blockages in the body and will constantly cleanse, clear, and protect the energy of your environment.
Simply lay your crystals on or near your selenite for a few hours at a time. Bring lucky energy to your space with this faceted fluorite crystal.

Minor imperfections are very normal, as these are handmade and natural stones. They illuminate light through the stone. 
Powers: Protection and Clearing
A slight variation in size is normal