Smokey Quartz - The Root Balancer
You can use this black, brown quartz stone to help heal your solar plexus, but it multi-versatile and can be used for the lower chakras, especially the root.
 
These chunks are fabulous for making grounding gem water,  using on alters or creating grids for the root chakras with your clients =. I place two in my cat's bed.   
 
Found: Madagascar