Galena, sphalerite and pyrite. Navan, Ireland

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Galena (white, top left) has triangular pits (black, centre top) due to plucking along the perfect (100) cleavage and is intergrown with sphalerite (light grey). Euhedral quartz (dark grey), showing a prismatic section (centre) and basal section (centre), occurs within sphalerite and has a lower reflectance than dolomite (small rhomb, centre right). Sphalerite inclusions occur in both gangue phases.

Polished block, plane polarized light, x 80, air

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