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Cryptomelane


Cryptomelane : K(Mn4+,Mn2+)8O16

Photo Copyright © Photo & Collection of Martins da Pedra  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: Serra da Mina, Cercal (Cercal do Alentejo), Santiago do Cacém, Setúbal District, Portugal
Sample botryoidal with 4x4x2cm - June of 2004

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