Hollandite

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

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At a glance

Class

Notion

Domain

Science and technology

In collections

1 player has it in their collection.

What Wikipedia says

Hollandite (chemical formula: Ba(Mn4+6Mn3+2)O16) is a manganese oxide mineral. Its structure consists of double chains of MnO6 octahedra delimiting 2 × 2 tunnels. The electrostatic charge created by the Mn3+ for Mn4+ substitution is balanced by cations in the tunnels.

Excerpt from the Wikipedia article “Hollandite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Leon Hupperichs, CC BY-SA 3.0, via Wikimedia Commons.