The desire to work with earth and cosmic energies, for some people is very strong. The ability to feel them sufficiently to evoke and harness those energies and vibrations enables their desires to manifest.
Crystals used for manifestation provide a focus for the incoming and outgoing powers.
For example, should a need for knowledge of a certain subject be necessary for a project, crystals relating to Jupiter could be used on an altar to evoke his energies. Crystals used in conjunction with an altar statue or effigy to evoke a certain deity can create a very powerful channel. Crystals which associate to the natural world relate to the quarter directions, the local planets and their correspondences, to the forests, seas, mountains, deserts, seasons, and the creatures of land, sea and air. Many of them can also relate to the various gods and goddesses, although special crystals should be obtained and dedicated to the individuals and their unique significances. Unfortunately, there is still a certain amount of fear relating to witches.