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Birnessite, Ussingite


Birnessite : (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O, Ussingite : Na2AlSi3O8OH

Photo Copyright © Bertil Otter  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: Karnasurt Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Black, prismatic crystal in ussingite. Specimen size 4x2.5 cm.

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