Pyrite. Galapagos Mound, Pacific Ocean

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Euhedral to subhedral pyrite (yellow-white) is banded, as seen by slight variations in reflectance (top left). A large organic structure is partially infilled by very fine-grained pyrite (left and right centre) which has picked out some of the internal structure. Black areas are polishing pits.

Polished block, plane polarized light, x 40, air

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