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pyrolusite

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py·ro·lu·site  (pr-lst)
n.
A soft, black to dark gray mineral, MnO2, the commonest and most important secondary ore of manganese.

[German Pyrolusit : Greek puro-, pyro- + Greek lousis, a washing (from louein, to wash; see leu()- in Indo-European roots).]

pyrolusite [ˌpaɪrəʊˈluːsaɪt]
n
(Earth Sciences / Minerals) a blackish fibrous or soft powdery mineral consisting of manganese dioxide in tetragonal crystalline form. It occurs in association with other manganese ores and is an important source of manganese. Formula: MnO2
[from pyro- + Greek lousis a washing + -ite1, from its use in purifying glass]
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.pyrolusite - a mineral consisting of manganese dioxide; an important source of manganese
atomic number 25, manganese, Mn - a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition


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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 minerals predominate over iron (hematite) and include pyrolusite, psilomelane/cryptomelane, hausmanite, and braunite.
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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