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Four undamaged cubic pyrite crystals with mirror-like faces intergrown on a matrix of marlstone (some people claim it to actually be limolite). Field collected in spring 2007. (Author: Carles Millan)

Four undamaged cubic pyrite crystals with mirror-like faces intergrown on a matrix of marlstone (some people claim it to actually be limolite). Field collected in spring 2007. (Author: Carles Millan)

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