Celestite, or celestine, is a sulfate mineral made of strontium sulfate. It usually appears as colorless, white, or pale blue crystals, which can form in clusters or as individual crystals with clear faces. Celestite is appreciated for its fragile look and is associated with calmness and peace. It is often used in spiritual practices to encourage relaxation, improve communication, and support spiritual connections. While it is not a common gemstone, collectors value Celestite for its beauty and unique qualities.