Chalcopyrite, tetrahedrite and pyrite. Ballycummisk, County Cork, Ireland

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Chalcopyrite (yellow, centre) is intergrown with silver-bearing tetrahedrite (light grey-green, bottom centre). A single crystal of pyrite (light yellow-white, top centre) is enclosed within chalcopyrite. Dolomite rhombs (medium grey, top right), euhedral quartz (centre left) and chlorite (bottom right) are the gangue phases.

Polished block, plane polarized light, x 80, air

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