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Pyrite cubes from Navajún, Spain. These are natural pyrite minerals and are famous all around the world for their incredible formation. Originally discovered in 1965, the mine has been continually worked to this day. The chemical formula for pyrite is FeS2.
The cube itself measures between 1.5 cm and 2.5 cm, and the whole cube in matrix is approximately 5 - 6 oz.
The photo is representative of the material and does not necessarily mean you will receive one of the exact cubes pictured.