piroluzit (manganez dioksit minerali)

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pyrolusite
A dark coloured mineral, consisting of manganese dioxide (MnO2), that is an important ore of manganese
a dark coloured mineral, consisting of manganese dioxide (MnO{2}), that is an important ore of manganese
Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name)
Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft
a mineral consisting of manganese dioxide; an important source of manganese
piroluzit (manganez dioksit minerali)