Black Tourmaline is great for overall grounding, really good for putting shields into materials with a talisman and is a super tool when doing a healing crystal or stone layout. Stabilizes and/or enhances electromagnetic fields. Calms the angry heart and reduces stress. Makes the spiritual body alert. Cleans out the gaps in the synapses with enhanced efficacy. Black Tourmaline is mostly crystalline so it is a higher frequency than magnetics.