Two Hematites, Pyrolusite on Manganite, Psilomelane, and Bauxite

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Description

TWO HEMATITES, PYROLUSITE ON MANGANITE, PSILOMELANE, AND BAUXITE Two massive hematites, Ontanagon, Michigan, USA, measuring 10 x 7 x 2 cm and 11 x 8 x 2 cm ; Pyrolustie on Manganite, Ironwood, Gogebic Co., Michigan, USA, measuring 8 x 7 x 5 cm ; Psilomelane, dark concretions on matrix,...

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measuring bauxite psilomelane michigan arkansas mining district specimen pyrolustie primary manganite massive montana saline pyrolusite ontanagon aluminum hematites ironwood gogebic dark philipsburg granite located production bauxirte deposits iron hydroxides concretions matrix started 1894 comprised oxides ceased rock 1985 mixture