Onyx is a variety of agate, which itself is a variety of chalcedony; it is an agate whose bands are circular and concentric. If the areas are polygonal instead of circular, the onyx is said to be fortified; if the bands form faint circles of color around a darker round spot, the onyx is said to be eyed.
The benefits : Balances the body and mind, strength, protection against negative energies.
Astrological signs : Libra, Sagittarius, Capricorn.
Chakra : Root.

