Pyrolusite

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

Pyrolusite Fe₇S₈ Jackson Mine, Negaunee, Marquette Co., Michigan Ex Bruce and Dale Wadleigh Collection

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 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