Jacobsite

  
 
  
 
   
 
  
 
  
 
 
  
Jacobsite on calcite
Origin: N'Chwaning II Mine, Kalahari Manganese Fields, South Africa
Sample size: 4.5 x 4 x 2 cm (top), 4 x 3.5 x 3 cm (2nd row), 2.2 x 2 x 1 cm (3rd row), 2 x 2 x 1.5 cm (4th row left), 2 x 2 x 1.5 cm (4th row right), 3 x 2 x 1.5 cm (5th row left), 2.5 x 2 x 1 cm (5th row right), 2.5 x 2 x 1.5 cm (6th row), 3 x 1.6 x 0.8 cm (bottom)
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

Black octahedral crystals with pyroxmangite in matrix
Origin: Bellerberg, Ettringen, Eifel, Germany
Sample size: thumbnail
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 
  
Black jacobsite with maybe iwakiite (?)
Origin: Långban, Varmland, Sweden
Sample size: 6 x 4.5 x 2 cm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

Origin: Iron Monarch, South Australia, Australia
Sample size: unknown
Sample owner: Steve Sorrell
 

Photo courtesy of: 

Steve Sorrell

Crocoite.com

 

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