Different Crystals can be used to help improve different Chakras.
Crown: This chakra connects one to the divine. Higher wisdom and connection to higher planes. Inner peace and integration with cosmic energy.
Thrid Eye: Connects one to information beyond science and the physical plane. Spiritual wisdom can be obtained and understood through this channel.
Throat: Allows for inner feelings and manifestations of human experience to be transformed into expression. Reflection, communication, and sharing.
Heart: This is the centre of the chakra system, holding an equal balance to the physical and metaphysical. Free love, and the neutralization of negative feelings.
Solar Plexus: Impulse based centre, promoting wishes and desires to be acted upon. Expression of the personality manifests through action.
Sacral: Connects one to their inner creative energy. Feelings and emotions flow freely, and manages relations of lovers and friends alike.
Root: Connects one to the earth, the physical world. The "I am" and "Being" center. The foundation for spiritual evolution to grow upwards from.