Question: what is the difference between black onyx and black tourmaline?
Answer: Here is a quick explanation of the differences in Onyx, Obsidian& Black Tourmaline. Onyxis a denser, more earthy crystal. ... Black Tourmaline is double terminated so it draws in any negative energy, transforms it and then releases the positive. All 3 are very protective, grounding and work with the Root Chakra.