Chalcopyrite and rutile. El Salvador, Chile

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Anhedral chalcopyrite (yellow, top right) is intergrown with quartz (light grey, right centre). Pounded to euhedral rutile (grey-white, centre left) is disseminated throughout the host rock. The poorly polished dark grey gangue is phyllosilicate.

Polished block, plane polarized light, x 80, air

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