iandol on mon 21 oct 02
Dear Lily Krakowski,
Just to enhance what you have said on this topic, let us not forget that =
Raw and Burnt Umber are regarded as being sources of Manganese Dioxide. =
Though the concentration of Manganese is lower than that of the minerals =
Psilomelane and Manganite it should be treated with respect.
Best regards,
Ivor Lewis. Redhill, South Australia.
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