Agate is a chalcedony is a band of chalcedony was generally showed flat or concentric circles of color layers, ribbons, as well as moss-like or dendritic chromospheres.

Agate color layers, ribbons, color body formation in nature, the gods of nature for land that was presented to mankind. Some color layer, such as tree growth rings, the United States the very nature; some chromospheres, such as from a generous splash-ink landscape painting; some ribbon also deemed a beautiful flower composition, very enjoyable, not put it down. According to the different colors can be divided into red agate, blue agate, black agate, white agate, gray agate, etc.! Italian name suggests, gray is the color gray agate!

 There are many different types of agate depending on the colors and formation. Common types of agate jewelry include blue agate, moss agate, green agate, tree and wood agate, Indian black skin agate, Montana agate, banded agate, red agate, graveyard point agate.

A Mexican agate, showing only a single eye, has received the name of cyclops agate. Included matter of a green, golden, red, black or other color or combinations embedded in the chalcedony and disposed in filaments and other forms suggestive of vegetable growth, gives rise to dendrite or moss agate.

Torricelli agate is formed from solidified fossil Torricelli shells. Torricelli are spiral marine gastropods having elongated, spiral shells composed of many whorls. Similarly, coral, petrified wood and other organic remains or porous rocks can also become agonized. Agonized coral is often referred to as Petoskey stone or agate.

Greek agate is a name given to pale white to tan colored agate found in Sicily back to 400 B.C. The Greeks used it for making jewelry and beads. Today any agate of this color from Sicily, once an ancient Greek colony, is called Greek agate. Yet the stone had been around centuries before that and was known to both the Sumerians and the Egyptians, who used the gem for decoration and religious ceremony.

Another type of agate is Brazilian agate, which is found as sizable geodes of layered nodules. These occur in brownish tones interlayer with white and gray. Quartz forms within these nodules, creating a striking specimen when cut opposite the layered growth axis. It is often dyed in various colors for ornamental purposes.