  A phenomenon analogous to the conical refraction well-known in the
crystalooptics and crystaloacoustics is considered for the
magnetohydrodynamical waves in a collisionless plasma with anisotropic thermal
pressure. Imposing the most general (generalization of Tsiklauri, 1996, Phys.
Plasmas, 3, 800) condition for the existence of the phenomenon, angle of the
conical refraction is calculated which appeared to be dependent on the ratio of
the Alfven velocity and sound speed measured in the perpendicular direction in
respect to the external magnetic field. Feasible ways of experimental
demonstration of the phenomenon are discussed and a novelty brought by the
general consideration is outlined.
