Chalcedony, the third stone of the circle, is essentially pure silicic acid. Typical for chalcedony is its structure. It is an extremely fine structure consisting of fiber-like crystals with in between some disseminated opal-silica. The total aspect of this often bluish gemstone is of an embracing gesture. This, in fact, is the essence of chalcedony: it represents the embracing power of the soul, an embracing power which is unselfish (silic acid), which is filled with soul power (opal is the gemstone of the soul) and which is not exclusive on the will side (chalcedony is not totally opaque like jasper).
- Dr. Simon van der Heide