Hollandite

(Ba,K)Mn8O16

This sample of hollandite is displayed in the Smithsonian Museum of Natural History. Hollandite is a oxide mineral of manganese with barium and potassium. It has the composition (Ba,K)Mn8O16. The sample at left is about 8 cm across and is from Serra do Navio, Brazil.

Mindat: Hollandite

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