Smoky quartz is known to be a protective and grounding Root Chakra stone that transmutes negative energy and purifies your aura.  It's a powerful healer that absorbs the energies the body cannot take or hold on its own.
 
The energy of smoky quartz is protective and empowering. It reminds us of the need to cut through superfluous information to get straight to the point, and remain focused and 'in the moment' all the time.
 
It's a handy tool to use during meditations or ceremonies, when you want to be aware of subtle energies, but also remain grounded. Plus, it can be useful to have around in the work place, when you're dealing with difficult situations or people.