You are looking at a Blue Chalcedony skull. The skull is 2.8 inches long?from front to back. It is the best stone to use for problems with the neck, tonsils, snd vocal cords. It protects against feverish infections and all types of inflammation. Chalcedony water can be made by boiling it with a pinch of salt and is used as a treatment for hoarseness. Psychologically, it offer self-confidence and protection from nightmares. Good luck stone for Cancer and protective stone for Sagittarius.It symbolizes calmness and composure. For the Tibetans it is the stone of purity and concentration on the essential. Chalcedony should be used with the throat chakra, but under no account should the stone be placed with azurite because together the stones would develop too strong a power. Chalcedony should be cleansed once a month under warm running water and, if possible, recharged by being placed overnight in an amethyst geode. An elixir can be made by putting rock crystal and chalcedony in a glass of water and leaving it overnight.