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Chemical Formula: SiO₂
Mineral: Chalcedony
Color: Varies from green to blue
Hardness: 6.5 - 7.5
Specific Gravity: 2.6 - 2.64
 

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Agate is a fine-grained, fibrous variety of chalcedony with colored bands or irregular clouding. Each individual agate forms by filling a cavity in host rock. It is found in concentric layers in a wide variety of colors and textures in various colors, forms that range from being transparent to opaque.

It comprises of intricate patterns varieties like: blue lace, green, Indian, Kentucky and moss. In the earlier times, Agate was given high value as a talisman or amulet. It was said to quench thirst and protect from fevers.

It is believed that Agate renders the wearer invisible and due to its strength and durability, it is used for making ornaments or for astrological purposes. Being a cooling stone, Agate is said to cure insomnia, protect against danger, promote strength and healing and ensures a healthy life.