Kyanite is excellent for attunement and meditation. It does not hold negativity and therefore never requires cleaning. Said to slice through confusion and dispel blockages of illusion, anger, frustration and stress. 
With a high frequency, it may stimulate psychic abilities and intuition. A natural pain relievr, lowering blood pressure and suporting the yin-yang energy.
Blue Kyanite specifically strengthens the voice and heals the throat.
Approx size 3cm long, 1-2cm wide.