  Dark resonances were formed via electromagnetically induced transparency for
the first time involving magnetically-induced $\Delta F = \pm2$ atomic
transitions of alkali metal atom, which are forbidden at zero magnetic field.
The probability of these transitions undergoes rapid growth when $300 - 3000$~G
magnetic field is applied, allowing formation of dark resonances, widely
tunable in the GHz range. It is established that for $\Delta F = +2$ ($\Delta F
=-2$) transition, the coupling laser tuned to $\Delta F = +1$ ($\Delta F =-1$)
transition of the hyperfine $\Lambda$-system must be $\sigma^+$ ($\sigma^-$)
polarized, manifesting anomalous circular dichroism.
