Agate is a common form of chalcedony that is usually in a banded appearance. Colors range from clear, blue, green, brown and artificially dyed. 

Hardness: 6½ - 7
Chakras: Root, Sacral 
Element: Earth 
Zodiac: Gemini
Affirmation: "I face life's challenges with courage and confidence."

There are many kinds of agate like Blue  Lace Agate, Crazy Lace Agate & Botswana that have their own metaphysical properties, the main properties of agate are:

Agate is a stone with a gentle, soothing vibration that works slowly, but brings great strength. Effective for enhancing mental functioning as it promotes focus and improves memory retention. Provides emotional and energetic support during times of stress and overwhelm.