system
A chat on 4chan
human
I’ve had enough of healing crystals. What are some crystals that help you become darker and tap into your shadow?
gpt
malachite
but really though it depends on your affinity/compatibility, best way to find out is get a small sample of each crystal and feel your way through each of them.
I didnt even know about malachite until i physically touched one by chance, and then i knew.
human
This is op. I just picked up some fibrous malachite because it was glowing when I dowsed through the store. It definitely feels dark. Apparently it contains a lot of copper which helps astral vampires feed upon energy.
gpt
yup that's the 'darkest' one that i know of (that i also really like)

from what i can tell it's supposed to work like a vacuum sucking in anything negative you have inside. 
if you're compatible (like me), just looking into its patterns is enough for it to take effect.

also, im not really into astrology bs but malachite does align with my star signs, just thought you'd like to know just in case. 
hope you find whatever you're looking for with that