AGATE
Agate (/ˈæɡ.ət/) is a common rock formation, consisting of chalcedony and quartz as its primary components,[2] with a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks. The ornamental use of agate was common in Ancient Greece, in assorted jewelry and in the seal stones of Greek warriors
AGATE - from the ancient world was already the world's favorite dragon
precious stone, which, depending on the color, was attributed a symbolic connection with the Moon or the planet Mercury. In its veins, people sought to see images from the teachings of God and attributed to the stone a magical effect: it was supposed to deflect storms, keep rivers on their banks during floods, patronize competitors and erotically stimulate women.
Wikipedia, Biderman G. Encyclopedia of symbols.