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Article: Mineralogy and chemistry of coronadite from Middle Cambrian manganese deposits at Wadi Dana, southern Jordan.(Report)
- Article from:
- American Journal of Applied Sciences
- Article date:
- April 1, 2009
- Author:
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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). The tetravalent Mn-oxides indicating oxidizing conditions during formation (4).However, coronadite is reported also to form during lateralization (5). Ehrlich et al., (6) found manganese nodules that were composed mainly of coronadite formed by epigenetic solution.
Coronadite is fairly rare mineral of the oxidation zone, is in most cases the product of simultaneous weathering of Mn and Pb-minerals; Pb-replacment deposits in Mn-rich limestones ...