Pyrrhotite, magnetite, pentlandite and chalcopyrite. Strathcona Mine, Sudbury, Ontario, Canada

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Pyrrhotite crystals (light brown) have granular pentlandite crystals (light brown, higher reflectance, centre left) along their grain boundaries but are free of flame-like exsolution bodies of pentlandite. Magnetite (grey, bottom left) encloses a crystal of chalcopyrite (yellow, bottom left). Black areas are polishing pits.

Polished block, plane polarized light, x 80, air

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