Kentrolite

  
  
 
     
  
This specimen has a drusy garnet vug with black crystals of what appear to be kentrolite included diopside. The diopside crystals reach up to 0.4 cm across.
  
This specimen contains amorphous grains and pods of kentrolite in calcite and phlogopite matrix. Ex. Harry von Eckermann Collection
  
This specimen has massive granular hausmannite and scattered deep red grains of kentrolite. Ex. Frank Edwards collection
Origin: Långban, Sweden
Sample size: 7.5 x 3.2 x 2 cm (top/2nd row), 8 x 7 x 6 cm (3rd/4th row), 5.5 x 4 x 3 cm (5th row), 6.9 x 6.8 x 3.2 cm (6th/bottom row)
 

Photo courtesy of: 

John Veevaert, Trinity Mineral Co

Trinityminerals.com

 

Black metallic grains with biotite in matrix
Origin: Långban, Värmland, Sweden
Sample size: micromounts
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

  
Origin: Langban mine, Varmland, Sweden (type locality)
Ex. DeVito Collection
Sample size: 4 x 3 x 2 cm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

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