Manganite
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Manganite is a mineral composed of manganese oxide-hydroxide, MnO, crystallizing in the monoclinic system. Crystals of manganite are prismatic and deeply striated parallel to their length; they are of
Manganite, Ilfeld, Thuringia, Germany (size: 5.2×4.1×2.7 cm)
Manganite crystal group
Groutite
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Groutite is a manganese oxide mineral with formula Mn3+O. It is a member of the diaspore group and is trimorphous with manganite and feitknechtite. It forms lustrous black crystals in the orthorhombic
Groutite crystals within a manganese nodule
