Sphalerite, pyrite and jamesonite. Ireland

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Concentrically banded pyrite (yellow, centre) is intergrown with sphalerite (light grey, bottom left). Acicular crystals of jamesonite (blue-grey, centre top) are found within calcite (dark grey) which shows bireflectance (top right).

Polished block, plane polarized light, x 40, air

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