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Of course: A chord’s mediant is another chord whose root is a third apart (it can be a major or minor third), in this case, a chromatic mediant is mediant chord of the same quality as the original chord (Eg: C - E, C - Eb, C - A, C - Ab. Or: cm - em, cm - ebm, cm - am, cm - abm). However, this is just a simplification (sorry, this is a bit complex). Diatonic mediants (C - em or cm - Ab) share two notes (E and G in the first case and C and Eb in the second case); Chromatic mediante share only one note (Taking the huge list above, in order, the notes are: E, G, E, C, G, Eb, C, Eb) we also have double chromatic mediants, this share no notes, but are still a third away (Eg: C - ebm, C - abm or cm - E, cm - A) So: Diatonic mediants have their roots a third away, have different qualities and share two notes Chromatic mediants have their roots a third away, have the same quality and share one note Double chromatic mediante have their roots a third away, have different qualities and share no notes The uses of chromatic mediants could be to: prolong the tonic or a certain degree of the scale (this could be further explored by employing chromatic mediants a minor third away of minor quality so they can be chromatically altered to form a common tone chord of the first chord (Eg: C - ebm - cdim - C, where c dim is a common tone chord)); to “smoothly” modulate by going from a chord to its chromatic mediant and then twist the harmony even more; to abruptly modulate by resolving a cadence to its chromatic mediant, eliding the tonic (G7 - E, eliding the C in between) or to just come up with a different way to use it that sounds good to you. Chromatic mediants between minor chords sound eerie, chromatic mediants between major chords sound uplifting, but it also depends if they are a minor third apart or a major third apart. Just explore them and use your favourites. If you have survived this soporific music theory lesson, let me give you one more fact about them: playing four chromatic mediants all a minor third apart gives you an octatonic scale and three chromatic mediants a major third apart gives you a hexatonic scale Sorry if this was a bit too long