While there are plenty of crystal skeptics out there, I’m someone who believes in these relics of the earth that have been used for centuries. (Fun fact: Roman warriors carried hematite in battle for physical protection, and ancient royal tombs are layered with lapis lazuli for protection in the afterlife.) Here are six of my favorite crystals to call on for protection from unwanted energies. Read on to learn a little bit more about each one, what it’s good for, and how to use it.