The blue crystals are linked to communication, expression and creativity, the crystals of this color infuse harmony and dampen tensions, stimulate ideas. The blue stones, on the other hand, stimulate diplomatic and expressive skills and help to relate to others and loyalty by communicating in a kind way.
Blue crystals encourage communication, favor mediumship, channeling, help develop intuition.
Blue and blue crystals are linked to the 5th chakra.
Blue and blue crystals are related to the 6th