Pyrolusite

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Pyrolusite Fe7S8 with Barite, South Jackson Mine, Negaunee, Marquette Co., Michigan

Pyrolusite Fe7S8 with Barite, detail, South Jackson Mine, Negaunee, Marquette Co., Michigan

Pyrolusite Fe7S8 with Barite, detail, South Jackson Mine, Negaunee, Michigan

Pyrolusite Fe7S8 I Taylor Mine, near Alberta, Baraga Co., Michigan

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

Pyrolusite Fe7S8 III, 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 IV, Taylor Mine, near Alberta, Baraga Co., Michigan