"Polianite" is a word in ENGLISH

polianite ENGLISH
Definition:

Manganese dioxide, occurring in tetragonal crystals
nearly as hard as quartz.

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manganite ENGLISH

A compound of manganese dioxide with a metallic oxide; so called as though derived from the hypothetical manganous acid.

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pyrolusite ENGLISH

Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its …

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A process for the recovery or regeneration of manganese dioxide in the manufacture of chlorine, by means of milk of …

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