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Birnessite

€12.00
Black and shiny crystal section in ussingite
Karnasurt, Lovozero, Kola peninsula, Russia
Quantity
Available

Black and shiny crystal section (2.5 cm) in ussingite. A good specimen
AN_210
1 Item

Data sheet

Locality
Karnasurt, Lovozero, Kola peninsula, Russia
Size category
Miniature
Size (cm)
5x3x3
Weight
44 g
Formula
(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
Properties
Black, soot-like. Soft and brittle. Shiny on unaffected surfaces