Certain crystals worked with particular types of magickal force better than others. Minerals have an inherent tendency which makes them harmonious with some energies, and discordant with others. For example, copper is a superb conductor of electricity, while lead is not. Lead provides an impassable barrier to radioactivity, yet itself is more vulnerable to heat than copper. Forces yet undiscovered by conventional science can also be affected by minerals.
Magicians routinely use minerals in magickal work, especially in preparing talismans.
Each stone and metal is particularly harmonious to a certaincategory of energy. 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.