  We present both experimentally and theoretically the transformation of
radially and azimuthally polarized vector beams when they propagate through a
biaxial crystal and are transformed by the conical refraction phenomenon. We
show that, at the focal plane, the transverse pattern is formed by a ring-like
light structure with an azimuthal node, being this node found at diametrically
opposite points of the ring for radial/azimuthal polarizations. We also prove
that the state of polarization of the transformed beams is conical
refraction-like, i.e. that every two diametrically opposite points of the light
ring are linearly orthogonally polarized.
