Pyrolusite Mineral Data
General Pyrolusite Information. Chemical Formula: MnO2. Composition: Molecular Weight = 86.94 gm. Manganese 63.19 % Mn 100.00 % MnO 2. Oxygen 36.81 % O. ______ ______ 100.00 % 100.00 % = TOTAL OXIDE. Empirical Formula: Mn 4+ O 2. Environment: