Chalcopyrite, sphalerite and stannite. Ririwai, Nigeria

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Chalcopyrite (yellow) is intergrown with sphalerite (grey). Sphalerite carries chalcopyrite inclusions, whereas chalcopyrite has sphalerite inclusions (dark grey) rimmed by stannite (light brown-grey, centre). Stannite also forms an incomplete rim between chalcopyrite and sphalerite (top centre).

Polished block, plane polarized light, x 160, oil

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