Check the listing for details. Selenite Crystal Mushroom $35. Condition: New. Listed at 21.75 USD. Selenite is a stone of mental clarity. This clarity enhances mental flexibility and enables strong decision making abilities. It can affect every day life as full mental clarity into play to lesson confusion and mental disorientation. Selenite is also a stone of truth and honesty. This promotes good business practices as well as honesty in other types of relationships.