Chalcedony: is a variety of Quartz that is formed, not of one single crystal, but of finely grained micro crystals is known as microcrystalline. The variety of Chalcedony Quartz available is even greater than that of macrocrystalline Quartz because it includes cryptocrystalline with patterns as well as a wide range of solid colors. Agate, Jasper, Onyx and Carnelian are all members of the microcrystalline and/or Chalcedony family. Chalcedony has a waxy luster, and may be semitransparent or translucent. It measures a hardness of 7 on the Moh's scale. The term "Chalcedony" is derived from the name of the ancient Greek town Chalkedon in Asia Minor, in modern English usually spelled Chalcedon, today the Kadikoy district of Istanbul. It is said that Chalcedony was used as a sacred stone by some Native America tribes, promoting stability within their ceremonial activities. Chalcedony is said to augment emotional balance, vitality, stamina, endurance, kindness, charity and friendliness. It is believed to alleviate hostilities, irritability and melancholy.