Xenotime, monazite and pyrite. Groverake, North Pennines, Britain

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Xenotime (darker grey, centre left) forms the core to later monazite (lighter grey, centre right) and both occur within quartz (grey), the main mineral. Very fine-grained pyrite (white, centre) infills later fractures. Black areas are polishing pits.

Polished block, plane polarized light, x 160, air

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