Chalcopyrite and sphalerite. Çeyeli, Turkey

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Very finely banded ore comprising fine-grained chalcopyrite (yellow) and sphalerite (grey). Thin veinlets parallel with the layering carry coarse-grained chalcopyrite and sphalerite (top right). The individual minerals can be resolved at higher magnifications.

Polished block, plane polarized light, x 80, air

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