Apophyllite is a silicate mineral known for its transparent or translucent crystals, which can be various colors and are commonly found in cavities within volcanic rocks. Its name comes from the Greek word for "flesh" or "exfoliate," due to its water content, and its luster is often pearly or vitreous. It is used both in collecting for its visual appeal and in alternative therapies, where it is believed to have calming properties, enhance intuition, and connect with the spiritual world.