4th chakra, Heart. This unique mineral offers both energies of Ruby and Zoisite. The Ruby is inside the Green Zoisite creating a nodule.  I like to think of them as offering love at the spiritual level. Also about increasing ones physical energy in order to get tasks done.  Great for those who lack energy and motivation.  Also a great conductor or energy.  Open your heart to the loving energy of Ruby-Zoisite. 
This is a nice larger specimen from my own collection.