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coronadite

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coronadite [‚kȯr·ə′nä‚dīt]
(mineralogy)
Pb(Mn2+,Mn4+)8O16A black mineral consisting of a lead and manganese oxide, occurring in massive form with fibrous structure; an important constituent of manganese ore.


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INTRODUCTION Coronadite is a Pb-Mn hydrous oxide that belongs to the tetravalent Mn-oxide-rich mineral that belongs to cryptomelane group, which is usually associated with supergene manganese ores (1), (2), (3).
 
 
 
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