приклади
It never occurs as a free element, but only in ores such as pyrolusite , manganite, psilomelane, and rhodochrosite.
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 (HCl).
The ore, a mixture of ‘psilomelane’ and pyrolusite with much manganiferous limonite, contains masses of cerussite.
Other
M-translate