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Pyrolusite

Iwaisawa Mine

Kitagawa, Hanno city, Saitama pref., Japan

Source for manganese

Pyrolusite

Field of view: 5 mm. Pyrolusite associated with caryopilite. The reniform black crust is pyrolusite.

Recovered from a chert-hosted bedded manganese deposit subjected to Pumpellyite-Actinolite facies metamorphism.

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