Concretions are grounding and help balance your energies.  When I saw this piece, I felt that someone would place their high energy crystal on it to calm the high vibration until they adjust to its energies.  It also brings in information from the past and can infuse that into the crystal that is placed on it.  It forms a solid foundation for any energy work that you would like to do.  This piece has a divot that will hold your crystal.
 
Size:  1" x 1.3" x .5".  1 available.