2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202761Quaternion quantum mechanics is examined at the level of unbroken SU(2) gauge symmetry. A general quaternionic phase expression is derived from formal properties of the quaternion algebra.Latex. 14 pages, no figures. Updates most of hep-th/9904067, to appear in the International Journal of Theoretical PhysicsHigh Energy Physics - Theorytext