These pyrite crystals formed exactly as you see them. Their cubic shape mirrors the internal cubic arrangement of iron and sulfur atoms. Because of its color and luster, pyrite is also known as fool's gold.
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Location: Logrono, La Rioja, Spain, Europe
Rights: This image was obtained from the Smithsonian Institution. The image or its contents may be protected by international copyright laws. http://www.si.edu/termsofuse