Mineral description : Manganite

Manganite from Bölet.

Mineral class Oxides : Pyrolusite - manganite group
Chemical formula MnO(OH)
Crystal system Monoclinic
Habitus Long elogated needlelike crystals in radiating groups or fibric aggregates.
Cleavage Good cleavage, uneven fracture.
Hardness 4
Density 4.3-4.4
Color Black.
Streak Reddish brown to black.
Luster Submetallic.
Occurance Forms in low temperature hydrothermal veins. Also formed in marine deposits and lakes.
Notes Soluble in hydrochloric acid with emission of chlorine.
Locations Mangaite exists i one good locality in Sweden.
  • Bölet manganese mine, Undenäs, Västergötland. As druses of black crystal needles with calcite, baryte and flourite.
  • Spexaryd manganese mine, Jönköping. In small amounts.
  • Långban and other manganese mines in Värmland. Sometimes found in small amounts.

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Last changed : 1998-03-07