All of the crystals in my shop have been acquired with great care and due diligence. To the best of my knowledge and unless otherwise noted, the crystals i share are natural and untreated. As with all things of nature, some crystals may have slight imperfections caused by growth environment, mining or carving. All crystals have been stored carefully to protect them while they are in my possession. Nature and life are perfectly imperfect. And that is what makes each crystal a unique, one of a kind treasure. Just like us thank you so much for visiting my shop. This item is made of prehnite, orbicular prehnite and prehnite skull.