Bournonite

  
  
  
 
  
  
  
Sharp, doubly-terminated, semi lustrous, tabular, silvery-grey color "cogwheel"-shaped crystal groups on pyrite matrix.
Origin: Machacamarca Mine, near Colavi, Dept. Potosi, Bolivia
Sample size: 7.2 x 5.2 x 5.2 cm (top/2nd/3rd row), 6.3 x 5.0 x 3.2 cm (4th/5th/6th/bottom row)
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

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