| It never occurs as a free element, but only in ores such as pyrolusite, manganite, psilomelane, and rhodochrosite. |
| Mineralogical composition of the fines at Balaghat and Ukwa mines is similar in nature and consists of Hollandite, Braunite, Psilomelane, Hematite, Apatite and Quartz. |
| Michele, by contrast, likes to work with tourmaline, agate druse, labradorite and psilomelane. |
| As an ore of manganese it is much less abundant than pyrolusite or psilomelane. |
