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HOLLANDITE (miniature)
HOLLANDITE (miniature)
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Hollandite, with the chemical formula Ba(Mn4+6Mn3+2)O16, is a manganese oxide mineral characterized by its unique structure, which features double chains of MnO6 octahedra that create 2 × 2 tunnels. The electrostatic charge resulting from the substitution of Mn3+ for Mn4+ is neutralized by cations located within these tunnels, and the specific type of cation present defines the mineral species: barium for hollandite, potassium for cryptomelane, lead for coronadite, strontium for strontiomelane, thallium for thalliomelane, and sodium for manjiroite. Pure forms of these minerals are uncommon, as most 2 × 2 tectomanganates consist of various tunnel cation mixtures. A mineral initially identified as hollandite, with the composition BaMn4+6Fe3+2O16, was discovered in the Kajlidongri mine in Madhya Pradesh, India. However, in 2012, the International Mineralogical Association reclassified it as ferrihollandite, which represents the barium-iron (III) endmember of the coronadite group.
From the former SUMMIT MINERALS Collection Alburquerque
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Dimensions and Weight are mentioned n the product description and will be used during check out to calculate the shipping costs. For example: 55 45 25 127 means Length 55 mm, Width 45 mm, Height 25 mm, Weight 127 grams. The weight is the approximate nett weight of the specimen including the mount (where applicable).
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