The cellular structure and vibrational patters of certain crystals make them particularly good allies for protecting you from negativity, EMFs (electric and magnetic fields that can drain your energy and scatter your focus), and spiritual or psychic attacks. Some of these protective stones include Hematite, Black Tourmaline, Obsidian, and Amethyst, but there are many more and a wealth of information about how to work with crystal protection. Crystal Protection is a subcategory under the Crystal modality.