Tellurobismutite, tetradymite and galena. Clogau Mine, Wales, Britain

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Tellurobismutite (white, right) has higher reflectance than tetradymite (green-blue, left). Galena (blue-grey, centre) inclusions occur at the junction of the two tellurium-bearing minerals. Black areas are quartz.

Polished block, plane polarized light, x 160, oil

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