Tellurobismutite and hessite. Clogau Mine, Wales, Britain

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Two tellurobismutite grains show strong anisotropy. Hessite inclusions (blue, centre and red-brown, top centre) also have very strong anisotropy and lie close to the grain boundary between the tellurobismutite grains. Black areas are quartz.

Polished block, partially crossed polars, x 160, oil

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