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Cryptomelane
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Cryptomelane is the potassium endmember of the hollandite group, a family of tectomanganates with a 2 × 2 tunnel structure.
Cryptomelane
Polyhedral representation of the 2 × 2 tunnel structure of cryptomelane. The black atoms represent K.
Polyhedral representation of the 2 × 2 tunnel structure of cryptomelane. The black atoms represent K.
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, Ilfeld, Thuringia, Germany (size: 5.2×4.1×2.7 cm)
Manganite crystal group
Manganite crystal group