Pyrolusite

These samples of pyrolusite are displayed in the Smithsonian Museum of Natural History. Pyrolusite is an oxide mineral of manganese with the composition MnO2 . This sample is about 6x6 cm and is from Marienberg, Westerwald, Rhineland-Pfalz, Germany.

This sample of pyrolusite is from Boston Hill Mine, Silver City , New Mexico. The sample is about 8x10 cm.

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