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pyrolusite |
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pyrolusite (pī`rōl  zīt), naturally occurring manganese dioxide, MnO2, a black mineral that crystallizes in the tetragonal system but is usually found in earthy or massive deposits. It is the principal source of manganese and its compounds, and it is extensively used in steel smelting and in the manufacture of dry-cell batteries. The main producing countries are Russia, Brazil, South Africa, Gabon, India, China, and Australia. |
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? Mentioned in | ? References in periodicals archive | |
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Within the oxidized zones, the primary sulfide minerals were commonly converted to limonite, pyrolusite, cerussite, anglesite, argentojarosite and plumbojarosite (basic sulfates of Fe), and native silver, with traces of malachite and azurite. Manganese occurs primarily as rhodochrosite (MnCO3) and pyrolusite (MnO2) and can be readily upgraded to electrolytic manganese dioxide (EMD) which currently sells for US$2,000 per tonne in the North American market. Manganese occurs primarily as rhodochrosite (MnCO3) and pyrolusite (MnO2) and can be readily upgraded to electrolytic manganese dioxide (EMD) which currently sells for US$2,000 per tonne in the North American market. |
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pyrolusite
