I believe its not always necessary to know the exact properties of every stone in order to choose one, although this may help, If you have a specific type of healing, meditation or energy work in mind. I feel its more natural to use your own intuition and allow yourself to be drawn to a stone or stones that will have meaning for you. As you are gazing at these Crystals, after you have had a good look at each one, close your eyes and relax, and when you open them choose the one you feel most drawn to. 

with moonbeam blessings Emma-Louise xxx