Mineral: Pyrolusite coated by iron oxide
Locality: Eiskeller shaft, Welkenbach, Westerwaldkreis District, Rhineland-Palatinate/Rheinland-Pfalz, Germany
Dimensions: Specimen size ~ 12 cm

Description: Pyrolusite coated with Brauner Glaskopf (I think this German word is the official term for this stuff) Collection Mineralogical Museum Marburg (my photo)

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