I have astral projected a hand full of times, but I have never felt this. The other day I was attempting to project. I had been practicing for about 45 minutes. I remember clicking out and then waking up again with my eyes closed. I then focused on mental ovement of my astral arms. Then I heard what sounded like a liquid metal, and then the earth started shaking! I mean it was a violent shake! And then everything. Stopped, I couldn't get out. Are those kind of vibrations normal? I was holding a piece of Moldavite crystal. Could this have changed the way I experience projection?