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HOLLANDITE

HOLLANDITE

608

$145.00 AUD
$145.00 AUD
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608
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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

Specimen details

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Care

It's important to know that many minerals can be effectively cleaned with water. However, before using any cleaning methods, such as dissolvers or ultrasound, please take the time to research online. Improper use of these techniques could potentially harm your specimen.

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