Selenite is a type of gypsum, which is a soft sulfate mineral made up of calcium sulfate dihydrate (CaSO4·2H2O). This mineral is recognized for its unique characteristics, such as its perfect cleavage that allows it to break easily into thin, flexible sheets. Selenite can appear in various states: transparent, translucent, or opaque, and it typically features a pearly or glassy sheen. It can be found in several manifestations, including large, blade-like crystals, fibrous formations known as satin spar, and even in the shape of desert roses. Selenite is commonly utilized for decorative reasons, in metaphysical practices, and for the cleansing and energizing of other crystals.