Crystals are minerals formed underground from three-dimensional repeating patterns of atoms. A crystal's appearance depends upon the natural characteristics of its type and the conditions in which it grows. Some take on strange shapes, some are very small and others grow very large, developing over thousands of years.
Different crystals have different energies and properties, and between them can affect mental, physical, spiritual and emotional aspects of ourselves. Simply holding the right crystal at the right time can bring about a change in our attitude and well-being. You don't necessarily need to look up the meaning each time you do this.