Galena and pyrite. Alderley Edge, Cheshire, Britain

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Galena (white, bottom right) cements quartz (dark grey, well polished, right) and feldspar (dark grey, less well polished, centre). An aggregate of small pyrite (yellow-white, centre top) crystals occurs between two feldspars. The larger feldspar (centre left) is euhedral and is partially authigenic in origin. Black areas are polishing pits.

Polished block, plane polarized light, x 80, air

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