Dark Blue Crystals are associated with both the Throat Chakra and Third Eye and their properties of intuition, inner wisdom and communication. Sometimes called Indigo, these crystals are used to enhance clarity of thought, help with decision-making and even resolution of legal problems. Dark blue crystals can also be useful in promoting self-expression, creativity, and spiritual growth. The most popular dark blue crystals include Sodalite, Iolite, Lapis Lazuli, and Azurite,