Pyrite after Pyrrhotite
Miniature, 5.6 x 4.1 x 1.5 cm
Nikolaivskiy Mine, Dal'Negorsk, Russia

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A sparkling, yellow druse of pyrite has replaced parallel growth, tabular crystals of what was once pyrrhotite that reached up to 3 cm. Tarnishing has added color variation to the pyrite crystals.
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