Manganite

The Manganite is a Minéral composed of the elements Manganèse - Oxyde - Hydroxyde, MnO (OH). It crystallizes in the form of a monoclinical system and it is isomorphous with the diaspore and the goethite.

The prismatic crystals striated in length are often grouped per packages. The color is of a dark metal gray with metallized black and its glare is chechmate submetallic. Its milked is brown-reddish transfering with the black. Its hardness is of 4 and its density is of 4,3. They have a perfect splitting parallel with the brachypinacoid whereas the splitting of the prismatic faces is slightly less less perfect. Twin crystals are not rare.

The mineral contains 89.7% of Sesquioxyde of Manganese. It dissolves in the chlorydric acid with release of chlorine. The most beautiful crystal specimens come from Ifeld in the Harz where the crystals are near calcite and of barite in veins of porphyry. Crystals were also discovered in Ilmenau in Thuringe, in Neukirch in Alsace, Granam in the Aberdeenshire and in Negaunee in the American state of the Michigan. It is much less abundant than the other manganese ores like the Pyrolusite (MnO2) or the psilomelane.

Its name was given by Haidinger in 1827.

Bond external

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References

  • Zeitschrift für Kristallographie, volume 118 - page 303 (1963)

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