And as Ashley Leavy, founder and educational director of the Love and Light School of Crystal Therapy tells mbg, black tourmaline is primarily found in Brazil and China, though it can also be found in Nigeria, Kenya, Madagascar, and more. “A lot of iron-based minerals have this historical connection—and modern connection—with protection,” Leavy notes, adding that true black tourmaline will always be opaque. “You shouldn’t really be able to see light through it. If you see any light passing through it, it’s probably a dry white tourmaline or a really, really dark green or even a really dark blue tourmaline.” “It cleanses your energy body, particularly when paired with a stone like selenite or Satin Spar,” Leavy says. “It has this great ability to keep you mindful of the present moment and really tuned in to what’s going on.” Leavy does note that if you’re working with a Brazilian variety of black tourmaline that’s very striated, you might want to avoid water, but other types (such as round, tumbled stones) should be fine. Whether you opt for cleansing with sound, moonlight, or sunlight, your black tourmaline will hold up just fine.