The strata-bound manganese orebodies of the Imini district formed in a laterally extensive karst cave system, developping in a shallow marine dolostone succession of Cretaceous age. The manganese ores occur in dolostone breccias and ferruginous clays.
The "Pyrolusites" from Imini are in fact Manganites partially replaced by Pyrolusite (analyzed), so the best description of them would be: Pyrolusite replacing Manganite.
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References
- Gutzmer, J.; Beukes, N. J.; Rhalmi, M.; Mukhopadhyay, J. (2006): Cretaceous karstic cave-fill manganese-lead-barium deposits of Imini, Morocco. Economic Geology 101, 385-405.
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