Pyrite

Pyrite

Please refer to the photo for size. 

Pyrite, often known as "fool's gold," is a captivating mineral with both scientific and metaphysical significance. Scientifically, pyrite (FeS₂) is an iron sulfide mineral renowned for its metallic luster and golden hue, which sometimes leads to confusion with real gold.
 Metaphysically, pyrite is believed to be a powerful protective stone, enhancing mental clarity, confidence, and abundance. It is said to shield against negative energy while stimulating the flow of creative and intellectual energy.