Agates are multi-colored and will work on many levels for healing. They engage primarily with both the physical and emotional levels of the energy field.
Because of the complex play of frequencies in agates, they will move outward from the physical layer of the energy field and into the other layers of the field, integrating them and grounding in the healing that is necessary in a particular body.
Dendrite agates connect the physical with the etheric, and it is a great stone to connect with the subconscious, the higher self and information from guides and spirits.