Nsutite is a major manganese oxide that occurs in mineable quantities in several terrestrial localities1 and has also been reported to occur in manganese nodules2. It has industrial importance3,4 since the intergrowth mineral and its synthetic analogue (γ-MnO 2) are used as the cathodic material in dry-cell batteries. The effectiveness of the material in batteries varies widely, and the physical cause of this variation is poorly understood. Structure imaging by high-resolution transmission electron microscopy (HRTEM) reported here reveals a variety of new structures and defects that may control battery efficiency by allowing increased diffusion rates.
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