Does it harm spirits or is it good for spirits?
What did your research say?
crystal is a cleanser. it absorb negative energy.
Neither unless you put some effort into making it do one or the other for whatever reason you come up with.
Even the ability to transmute or absorb unwanted energy needs a human’s interaction to happen. Tourmaline mines are not automatically hubs of peace and tranquillity. The association is because it’s black, and black crystals are all considered to be absorptive. That’s a human mental construction. I.e., we magically make it true collectively.
That means you, as a magical being can work with that, or do something else. It’s up to you.
yes. crystals are more powerful with intention. yet it still have it’s natural property of absorbing or changing /purify / cleansing negative energy. it also block psychic attacks.
good crystal stone to have for protection for oneself. as for harming entity spirits? depends on the spirit i would say. Ask the spirit.