Pyrite (Fool's Gold) - Mental Stability

Pyrite is a powerful protection stone known to shield and protect against all forms of negative vibrations and/or energy, working on the physical, etheric, and emotional levels. It stimulates the intellect and enhances memory, helping to recall relevant information when needed. Pyrite assists one in seeing behind facades, promoting an understanding of that which lies beneath words and actions.

Chakras - Solar Plexus 
Zodiac - Leo
Planet - Mars
Element - Fire and Earth
Vibration - Number 3