Hi, Deszroo! Now, I want to make it clear that I follow a personal . . . system?
when I use crystals. It's very intuitive, and changeable. Now, disclaimer over:
I'd use selenite for this, and also celestite. I have a selenite egg that is wonderful, just wonderful, for clearing my thoughts when they are whirling for lack of release. Selenite wands (natural) are commonly used to cleanse auras. A second person passes the wand through the aura of the subject. I just bought a lovey celestite geoded egg which gives the most beautiful feeling of purity, calm and peace. I believe that some people use celestite for contact with higher sources of wisdom, especially angelic beings. I'm not "into" angels, myself, but I love the energy of this crystal. It's extremely powerful.
Possibly jet, black tourmaline, smokey quartz to absorb and remove the negatives?
When I use my crystals, I mostly just hold them and try to calm my thoughts. I focus on "the here and now" as my crystal mentor puts it. Allowing the crystal to work with me was a challenge at first, but once I got the hang of opening to it, it really helped me to let the energy work on a deep level.
I hope this helps, and that it made some sort of sense. Blessings.
\m/ Kat