You're making a connection I'm not, then; and on a broader note would psionics even be part of this overall magic plan or treated as its own discrete system?
Purple is often associated with the mind and thought. And while psionics may not be part of the magic system, mind control, phantasms, and telepathy usually are.
Going by some color association pages I grabbed online:
Red: passion, danger, luck, fire, blood, wrath
Orange: warmth, energy
Yellow: the sun/heat, joy, cowardice, noticability
Green: nature, healing, growth, money, sickness, jealousy
Blue: water, the sky, wisdom and intelligence, stability, sadness
Purple: calmness, thought, royalty, religion/spirituality, wealth
Black: negativity, death, grief, evil, power
White: perfection, softness, cleanliness, purity, unification, coldness, ice/snow, sterility, death
Pink: love, playfulness, femininity
Brown: wholesomeness, honesty, outdoorsiness, agriculture, comfort
So whether the magic would flow from these sorts of interpretations or if colors would be added willy-nilly (like acid being associated with orange and green for energy), I dunno.