Pyrite, sphalerite and chalcopyrite. East Pacific Rise, Pacific Ocean

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A transverse section through an organic structure (worm tube?) which has poorly crystalline to euhedral pyrite (light yellow-white) associated with it. Euhedral to subhedral sphalerite (light grey, top) is intergrown with minor amounts of chalcopyrite (yellow, top centre). Black areas are polishing pits, dark grey areas are non-sulphides (bottom).

Polished block, plane polarized light, x 40, air

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