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,...