Pyrite from Navajun, Spain.
Navajun, Spain is an area where the conditions for forming pyrite have been perfect for millions of years. Navajun is located within the Cameros Basin, on the eastern side. In this basin, a perfect mixture of aquifers settles above rocks which are subject to low-grade hydrothermal metamorphism. In simpler terms, there is just the right amount of pressure, minerals, and water to produce massive pyrite crystals