manganez filizi

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manganite
a dark gray mineral of manganese, MnO(OH), found throughout North America and Europe
It occurs in brilliant steel-gray or iron- black crystals, also massive
a black mineral consisting of basic manganese oxide; a source of manganese
{i} mineral having a black color and being comprised of manganese oxide
A compound of manganese dioxide with a metallic oxide; so called as though derived from the hypothetical manganous acid
One of the oxides of manganese; called also gray manganese ore