Agate

Agate enhances mental functionperception and analytical abilities. Besides of improves concentration, it is a soothing and calming gemstone that heals inner anger, and anxiety.  

Agate Associations
Zodiac:  Gemini, Virgo
Planet;  Moon
Element: Earth
Numerical Vibration: Number 7
Typical colors: Clear or milky white, white to grey, light blue, orange to red, black