The volcanic and volcano-sedimentary units in which Mn mineralization occurred mostly consist of mega-porphyritic andesite, spilitic lavas, tuffite, and tuff.
In India, the spilitic basalts near Mumbai (Bombay) are famous for their zeolites, and this is the only region of the Deccan Plateau basalts where certain non-zeolite species, including hematite, occur.
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