Chalcedony is a variety of quartz, other types of quartz are amethyst, citrine, agate, jasper, smoky quartz, praisolite and aura quartzes.
Being a variety of quartz, chalcedony's have a mohs hardness of 7.
Chalcedony's come in a variety of colors.
Unlike most quartzes, chalcedony's don't have a star variety.
Native American Indians believed chalcedony was a sacred stone and used in the spiritual ceremonies of the tribe.
It is thought to increase vitality, stamina, and endurance and to promote emotional balance and charity while relieving melancholy, fever, gallstones, and eye problems.
Moonstones's gemstone on Chalcedony is located on her forehead. It is in the shape of a diamond and is smooth with no facets. It has a dark blue ring around the edge and is symmetrical on both sides.
Obsidian's gemstone on Chalcedony is located in the center of her lower-chest area. It is in a circular shape and is smooth with no facets. It has a white ring around the edge and has a flatter bottom.