  Quantum mechanics with quaternionic mass is considered. The momentum
eigen-value equation with quaternionic mass yields the Klein-Gordon equation
with a mass consisting of longitudinal and traverse masses. The scalar field
total mass is found to be a sum of these masses. This field appears to be
connected with two subfields conserving linear momentum. It is found that a
particle with real mass satisfies the quantum Telegraph equation, whereas that
one with quaternionic mass satisfies the Klein-Gordon equation. A quantum force
acting on the particle is found to be proportional to its velocity. When the
particle field is coupled to an electromagnetic field, an additional term in
the particle's energy appears reflecting the interaction of the particle's
angular momentum with the magnetic field.
