a common mineral, manganese dioxide, MnO 2 , the principal ore of manganese, used in various manufactures, as a decolorizer of brown or green tints in glass, and as a depolarizer in dry-cell batteries.
The deposit was composed mostly of pyrolusite and upgraded seaports and power stations.
pyrolusite is abundant in cracks and pods along outcrops of deposits that consist principally of psilomelane in depth.
There is thus no scheelite recovery process or pyrolusite concentration technique per se.
British Dictionary definitions for pyrolusite
a blackish fibrous or soft powdery mineral consisting of manganese dioxide in tetragonal crystalline form. It occurs in association with other manganese ores and is an important source of manganese. Formula: MnO2
C19: from pyro- + Greek lousis a washing +-ite1, from its use in purifying glass
"manganese dioxide," 1828, the name given in Roman times, when it was used, in a heated state, to de-colorize glass, from Greek elements pyro- "by heat, by fire" (see pyro-) + lysis "a loosening" (see lose).