Agate is a cryptocrystalline variety of silica, made up of mostly chalcedony. It has a very fine grain, and often has a banded appearance. It was named by a Greek philosopher, who discovered it in what is now Sicily.
Agates are thought to be grounding, stabilizing stones that are ideal for emotional, physical and mental balance. They are thought to improve concentration, acceptance of self, and letting go of internalized anger. Agate takes you through the layers of yourself and helps you learn more about who you are, letting go of blockages, and discovering what paths you should be exploring.