| It never occurs as a free element, but only in ores such as pyrolusite, manganite, psilomelane, and rhodochrosite. |
| For years we have successfully used pyrolusite for the catalytic deferrisation and demanganisation of ground and process water. |
| Acicular crystals and crystal aggregates of pyrolusite are found in vugs in the pegmatites of the district. |
| Scheele produced chlorine by treating the mineral pyrolusite with hydrochloric acid. |
| The granular pyrolusite can be used both in pressurised and unpressurised systems. |
| Because pyrolusite is not used up during the deferrisation it offers an economic advantage compared to other deferrisation-materials. |
