There is another stone with this twining effect, that is the bloodstone (or blood jasper) green in colour with the red jasper specks. The stone allows energy to commute between the base (Red) and the heart (Green) chakras, activating the grounding centre and the compassionate seed. It is a good foundation stone to prepare you for the eventual stirring of the kundalini energy, making the experience less traumatic.
And it is also a good money attracting stone, which you can wear along or even place it inside your cash register if you are doing business.
Blessings