Mainstream magicians categorize energies according to Astrological symbols. Thus, copper and emeralds are found to harmonize with the forces symbolized by Venus. Amethyst and tin correspond well with energies called Jupiterian. The energies placed under the categories of Mars work well in conjunction with Iron, bloodstone and jasper. Each stone and metal embodies tendencies which correspond to unseen forces and energies.
Crystals often serve as an object which links the bearer with the unseen force.
It takes more than just wearing a stone to contact this force. The person must consciously focus his will to making the link. Much of the work will be within his own mind and emotions. Magickal force most closely equates with feelings, rather than intellectual ideas. The crystal serves mainly as a link and reservoir of such energies.