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abrasive area background beautiful black bornite brass brilliance chalcopyrite chemical chemistry close closeup colored copper crystal crystalizes crystals cut detail detailed details different earth formation gem geology geothermal green hard hardness hydrothermal inclusions inorganic iron macro material metamorphic mine mineral mineralogy mohs nature ore pegamatite petrology precious pyrite rare raw rock rocks rough sample scale sediment sediments shaft shape sharp shine shiny shot special specimen still stone stones structure studio substance sulfide sulfur surface texture textured thermal tinged uneven yellow