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Pyrite Single Cube in Matrix From Spain Colour:Small alyssium seedsPyrite specimens in Marlstone, from Navajun, La Rioja, Spain. These specimens, in 3 sizes, are fine examples of the typical cuboid crystals of Pyrite. Small and perfectly formed, these are a great starter pieces for any budding collector. Rated at 6. 5 on the Mohs hardness scale, the brilliant golden colour and metallic lustre of the pyrite cubes are in elegant relief to the organic nature and earthy striations of the marlstone bed. Pyrite's metallic