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Siderite Nikolaevskiy Mine, Dal’negorsk, Primorskiy Kray, Russia 4.2 x 5.7 cm. Tan spheres of siderite that look like they are undergoing mitosis. (Author: crosstimber)

Siderite
Nikolaevskiy Mine, Dal’negorsk, Primorskiy Kray, Russia
4.2 x 5.7 cm.
Tan spheres of siderite that look like they are undergoing mitosis. (Author: crosstimber)