Selenite is a soft crystal that is a form of gypsum.  Fundamentally a protective stone, Selenite can cleanse negative energies.  In addition, this crystal is a cleanser for other crystals.  Selenite has another unique ability.  It does not store or hold energy.   Cleansing the aura is also in the range of capabilities for Selenite.  Not only is it a cleanser, but being associated with the third eye and crown chakras, enables Selenite to aid spirituality and intuition.  A cleansing and protective stone, Selenite is a great addition to any collection, and a great way to cleanse other crystals.