Bornite

  
  
A sheet of native silver, which was a thin vein in matrix, with the matrix having been removed to leave just the silver, with a coating of dark bornite.
Origin: Zacatecas, Mexico
Sample size: 7.4 x 6.3 x 0.4 cm
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

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