A crystal with two terminations at the same end, which have developed from one base. These are wonderful crystals to promote togetherness and help find a soul-mate. They can also help us gain insight into the underlying problems of a relationship, and guide us through working things out. They cover all relationships whether romantic, family or friends. A twin crystal with a rainbow is especially good for healing a damaged relationship, or keeping a relationship strong. It is not possible to use the twin crystal to help others with relationship problems, as one of the twins will be specifically tuned to your energies, therefore making them very personal crystals, to be used for your own relationships.