This system of using Chakra colour associations is a general guide and some crystals may work for more than one Chakra, but it is still a good place to start. The following correspondences are based on ancient knowledge and also my own personal work with crystals.
The chart is based on information in my book Crystal Healing For The Chakras, which also goes into a lot more detail. To use the Cheat Chart just look at the main colour of your crystals and see which Chakra it relates to. I have also included some helpful keywords for each Chakra so you can get an idea of the type of properties your crystal has.