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

Video on Instagram