Mineral description : Psilomelane

Psilomelane as small nedles in manganite from Bölet.

Mineral class Oxides : Pyrolusite - Manganite group
Chemical formula (Ba,Mn)3(O,OH)6
Crystal system  
Habitus Botryidal aggregates or earthy masses. It also forms as dendrites.
Cleavage  
Hardness 6 (or lower on earthy variants)
Density  
Color Black to dark gray.
Streak Brownish black.
Luster Submetallic to dull.
Description  
Occurance Often as weathering products from other manganeese minerals.
Associates  
Notes  
Locations Not so common in Sweden.
  • Skidberget and Nålberget, Leksand area, Dalarna. As earthy crusts and aggregates in brecciated quartzite.
  • Stollgruvan, V. Silvberg, Dalarna. As dendrites.

To oxides index.
Mineral group index.
Main index.

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axelsson@acc.umu.se
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Last changed : 1998-03-07