On the alteration of psilomelane, pyrolusite and manganite

To ascertain the origin of manganese minerals, I studied the thermal differential curves and X-ray properties (powder method) of manganese oxide minerals (psilomelane, pyrolusite and manganite etc.), and following results were obtained. Psilomelane, pyrolusite and manganite denote different dissociations for a temperature. (Each thermal differential curves also are different.) At about 600°C, psilomelane was altered to manganite, and pyrolusite to manganite, but manganite was not changed. Moreover, when psilomelane, pyrolusite and manganite were treated in a water for 200 hours, manganite was altered to psilomelane, and pyrolusite to psilomelane, and psilomelane was not changed. From above results, psilomelane, pyrolusite and manganite were altered each other by the influence of temperature or water, and they will be occurred in nature in altered forms through the complicated processes.