Double Terminated. Negative Energy Blocker
A psychic shield deflecting and dispelling negative energies, entities, or destructive forces.
You might think of it as a lightening rod, taking any negative energy and grounding it into Mama earth where she can transform it back into pure potential.
A small number of Black Tourmalines are double-terminated. These are the ideal specimens for body layouts, because the linerar flow of energies is enhanced equally in both directions along the crystalline form. Healing practioners who utilize crystals are especially advised to use these with their clients.