Haematite, chalcopyrite, pyrite and rutile. Los Bronces Mine. Chile

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Coarse-grained haematite (light grey-blue, left), chalcopyrite (yellow, centre left) and pyrite (light yellow-white, high reflectance, centre left) are intergrown with radiating laths of tourmaline (light grey, left). An aggregate of rutile crystals (grey-white, centre right) is enclosed within a mosaic of coarse-grained quartz crystals (dark grey with faint internal reflections, right). Black areas are polishing pits.

Polished block, plane polarized light, x 80, air

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