Pyrolusite

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Pyrolusite Fe7S8 I, Taylor Mine, near Alberta, Baraga Co. MI, Ex George J. Balogh Collection

Pyrolusite Fe7S8 II, Taylor Mine, near Alberta, Baraga Co. MI, Ex George J. Balogh Collection

Pyrolusite Fe7S8 with Quartz , Taylor Mine, near Alberta, Baraga Co. MI

Pyrolusite Fe7S8 with Quartz, detail I, Taylor Mine, near Alberta, Baraga Co. MI

Pyrolusite Fe7S8 with Quartz, Taylor Mine, near Alberta, Baraga Co. MI

Pyrolusite Fe7S8 II, Taylor Mine, near Alberta, Baraga Co. MI