Sphalerite and gersdorffite. Nenthead, North Pennines, Britain

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Small gersdorffite crystals (white, right) occur within zoned sphalerite. Zoning in the sphalerite is just visible as blue-grey (centre) and brown-grey (bottom right) areas. Black areas are polishing pits.

Doubly polished thin section, plane polarized light, x 40, air

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