Pyrolusite - USGS ID Stose, GW 1425

Pyrolusite and wad - B, earthy compact wad traversed by a sigmoid band that is of similar composition but has a rod like comb structure and radiate arrangement (the wad apparently is the process of changing to a compact and rod like psilomelane), from Doe Valley mine. Johnson County, Tennessee 1918. Plate 9-B in U.S. Geological Survey Bulletin 737. 1923.