Pyrite

A powerful protection stone that takes it's name from the Greek word for Pyr, which translates to fire

Also known by the nickname, Fool's Gold

Spiritually, it is an excellent shield from negative energy
It blocks out negativity and bad vibrations
It promotes happiness and personal acceptance
It promotes free and honest communication
It enhances strength of mind and willpower
It stimulates the intellect and enhances memory
It assists one in seeing behind facades
It unblocks and inspires creativity
It encourages strength and leadership qualities
It helps overcome fears and anxieties  
It boosts confidence levels  

Physically, it helps with blood issues, bone diseases, fungal infections and skin ailments  
It can be used in the treatment of bones and in the healing of cell formation  
It treats lung disorders, bronchitis and cleanses the oxygen that passes through the body
It builds strength, stamina and has been used to reduce swelling  
It helps the body fight viral infections
It can stimulate endocrine function  
It can help with fertility issues for both male and female