A "Key" is a notch Mother Nature imprints on some lucky crystals. When meditating "plug" your thumb into the notch in the hand pointing up. This helps "plug" one into Source. 
 
Smoky Quartz
Root Chakra—Removes negative emotions Relieves stress, fear, anger -Assists in achieving personal & business goals  -Manifestation of ones dreams & inspirations into physical reality -Dispels the physical effects of negative energies Transmutes unlimited amounts of negative energies into positive energy -Protective & grounding