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Birnessite

€8.00
Black crystal section in ussingite
Karnasurt, Lovozero, Kola peninsula, Russia
Quantity
Available

Sooty black 2 cm crystal section in ussingite
AN_204
1 Item

Data sheet

Locality
Karnasurt, Lovozero, Kola peninsula, Russia
Size category
Small miniature
Size (cm)
3.5x3x2
Weight
25 g
Formula
(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
Properties
Black, soot-like. Soft and brittle. Shiny on unaffected surfaces