Chalcopyrite, Sphalerite, Pyrite, Quartz Specimen (7” x 4”) tourmaline High quality display specimen features

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Chalcopyrite, Sphalerite, Pyrite, Quartz Specimen (7” x 4”) tourmaline High quality display specimen featuresThis spectacular specimen comes to us from the Madan Ore Field Rhodope Mountains, Smolyan Oblast Bulgaria. This specimen is a rare combination of Chalcopyrite, Sphalerite, Pyrite, Quartz that displays black and white crystal clusters. Chalcopyrite is a copper iron sulfide mineral that crystallizes in the tetragonal system. Chalcopyrite is known to have a brassy to golden yellow color and a hardness of 3. 5 to 4 on the Mohs scale. Chalcopyrite is