I have spirit guides that have helped me to travel and explore the astral. I've come across quite a few over the years some animal, some humanoid, some other worldly even. I meet new ones as I reach new plateaus in my development. Each one normally embodies aspects of being that I need to master to whatever lesson I'm learning spiritually at the time. I use crystals, incense, color, and candles to enhance my meditations and, yes, I do think that crystals can radiate energies.