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Acicular crystals and crystal aggregates of pyrolusite are found in vugs in the pegmatites of the district.
The ore, a mixture of ‘psilomelane’ and pyrolusite with much manganiferous limonite, contains masses of cerussite.
It never occurs as a free element, but only in ores such as pyrolusite , manganite, psilomelane, and rhodochrosite.
Scheele produced chlorine by treating the mineral pyrolusite with hydrochloric acid (HCl).
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