Smokey quartz is a powerful grounding and balancing stone. It helps in exploring your own feelings, emotions, and memories - allowing you to move towards a healing process. This crystal is all about letting go and surrendering. I personally like to use it as a stone to diffuse negative energy; the grey complexion with cracks and fractals within the inside looks as if it diffuses and diverts bad vibes.
Resources on Smokey Quartz: