  We show that symmetry of the crystal lattice of exchange magnets (containing
only 3d magneto-active elements) does not change at the Curie point; only the
magnetic symmetry of the crystal is decreasing in the transition point. In the
non-exchange magnets (containing only rare-earth magneto-active elements), on
the contrary, both the magnetic and crystal-chemical symmetry decrease at the
Curie point. There is isotropic magnetic phase in exchange magnets; and their
magnetic symmetry is described by color groups of magnetic symmetry of P-type.
Non-exchange magnets do not have isotropic phase; their symmetry is described
by color groups of magnetic symmetry of Q-type.
