Manganite

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Manganite is a mineral composed of manganese oxide-hydroxide, MnO(OH), crystallizing in the monoclinic system (pseudo-orthorhombic). Crystals of manganite are prismatic and deeply striated parallel to their length; they are often grouped together in bundles. The color is dark steel-grey to iron-black, and the luster brilliant and submetallic. The streak is dark reddish brown. The hardness is 4, and the specific gravity is 4.3. There is a perfect cleavage parallel to the brachypinacoid, and less-perfect cleavage parallel to the prism faces. Twinned crystals are not infrequent.

The mineral contains 89.7% manganese sesquioxide; it dissolves in hydrochloric acid with evolution of chlorine.
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  • Manganit

    Manganit

    Szürke, fémes fényű, rostos...

    Object information
    Image: Herman Ottó Múzeum - CC BY-NC-SA

  • Manganit

    Manganit

    Object information
    Image: Herman Ottó Múzeum, Miskolc - CC BY-NC-SA

  • Manganit

    Manganit

    3-4 mm hosszú, acélszürke,...

    Object information
    Image: Herman Ottó Múzeum, Miskolc - CC BY-NC-SA

  • Manganit

    Manganit

    Ólomszürke, max. 7 mm-es,...

    Object information
    Image: Herman Ottó Múzeum, Miskolc - CC BY-NC-SA

  • Manganit

    Manganit

    Mai neve: manganit, Lelőhely:...

    Object information
    Image: Viski Károly Múzeum Kalocsa - RR-F

References

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