Occurence:
Worldwide.

Appearance:
Agate is a banded colored stone found in nodular masses associated with volcanic lavas. The curved banding is distinct from other forms of chalcedony. Agate, being porous, is often dyed or stained. Large agates are often cut in half and dyed to form attractive bookends. Agate occurs in a variety of forms, including petrified wood, which has had it's organic matter replaced by agate.

Something Extra:No gemstone is more creatively striped by nature than agate, chalecedony quartz that forms in concentric layers in a wide variety of colors and textures. Each individual agate forms by filling a cavity in host rock. As a result, agate often is found as a round nodule, with concentric bands like the rings of a tree trunk. The bands sometimes look like eyes, sometimes fanciful scallops, or even a landscape with dendrite trees.

Agate was highly valued as a talisman or amulet in ancient times. It was said to quench thirst and
protect from fevers. Persian magicians used agate to divert storms. A famous collection of two to
four thousand agate bowls which was accumulated by Mithradates, king of Pontus, shows the
enthusiasm with which agate was regarded. Agate bowls were also popular in the Byzantine Empire.
Collecting agate bowls became common among European royalty during the Renaissance and many
museums in Europe, including the Louvre, have spectacular examples.
 
The following are different colour of Agate:
-   Blue Lace Agate
-   Botswana Agate
-   Crazy Lace Agate
-   Dendritic Agate
-   Dyed Agate
-   Fire Agate
-   Tree Agate