Gypsum is an evaporite mineral most commonly found in layered sedimentary deposits in association with halite, anhydrite, sulfur, calcite, and dolomite. Gypsum (CaSO4.2H2O) is very similar to Anhydrite (CaSO4). The chemical difference is that gypsum contains two waters and anhydrite is without water. Gypsum is the most common sulfate mineral. (https://geology.com/minerals/gypsum.shtml )
Selenite, a variety of gypsum from Penfield, New York.
Selenite is closely related to the other crystalline forms of Gypsum: Satin Spar, a compact fibrous variety that is generally translucent with a pearly chatoyant appearance; Desert Rose, most often bladed in the familiar shape of a rose with an outer druse of sand, or with sand throughout; and Gypsum Flower, an opaque variety usually attached to a matrix with spreading fibers forming a myriad of shapes, sometimes with severe curves and bends. While all have, at times, been grouped together and collectively called Selenite, the variety producing transparent, well-formed crystals remains the true Selenite
Selenite are prized by crystal healers for purification and all types of energetic cleansing because of their pure vibration. Selenite are amplifiers and will enhance the vibration of other stones.
Selenite is best used to clear blockages and densities in the energy field, and to direct high-frequency energy.
Selenite may be used to calm and stabilize erratic emotions, and to clear away confusion, feelings of inadequacy, jealousy, doubt or other forms of negativity.
Clarity of thought
Purity of heart