I don’t know if there is a crystal what vibrates to the 5 level of Reiki, but
most (if not all) of stones have an ability to accumulate energy. They emit both energies: one to be determined by their crystal structure, the other with whom they are charged.
Latvia has a powerful place where very many stones are. People come to this place to be healed. These stones are simple boulders, mostly granite. Their special ability to heal is explained by the fact that there is the earth’s crusts breaking point and therefore there is a much stronger flow of energy. Stones accumulate this energy, and therefore the radiation is unusually strong. If these stones are transported to another location, they lose their healing properties.
So I think that most of the stones can be charged with a certain energy vibrations also with reiki 5. Because each of stone have also his own energy, charging with Reiki can also take into account the characteristics of the stone itself, in such way achieve a double healing effect.
Inese