Sphalerite and galena. Alderley Edge, Cheshire, Britain

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Galena (white, top left) and sphalerite (light grey, centre top) are the main sulphides cementing the quartz grains (dark grey). Sphalerite has a thin discontinuous galena veinlet within it. Dark areas (right centre) arc polishing pits infilled with ¼śm diamond paste which gives diffuse light-coloured internal reflections.

Polished block, plane polarized light, x 80, air

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