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  Take a look at this awesome set of perfect Pyrite cubes (of assorted sizes) from the La Rioja region, which is in northern Spain, just below the Basque Province in the Ebro valley. These magnificent crystals are extracted from a limestone matrix and are comprised of mostly Sulphur and Iron with a ratio of about 30% Iron to 70% Sulphur (which accounts for its golden color) and occasionally you will find traces of Gold, Silver, Coppe....]]>