Quartz crystal – Overall balance of the chakra system. Amethyst – It is concerned with understanding knowledge, and mental organizing. Sodalite – Communication, personal expression and the flow of information. Green quartz – Deals with relationships and personal development. Citrine – Helps give self confidence and personal power. Agate – Its functions are creativity feelings and sexual drive. Hematite – It gives stability energy distribution and physical survival. Crystals carry energy and need to be regularly charge and cleansed. This can be done by simply running the crystal under the cold tap while visualising the negativity being washed away. A night on your windowsill in the moonlight (full moon is particularly effective) will give your crystal an energy boost.