Simpsonite

Origin: Alto de Giz Equador, Rio Grande de Norte, Brazil
Sample size: single crystal to 10 x 5 x 5 mm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

 
  
  
Origin: Alto do Giz Mine, Equador, Rio Grande do Norte, Brazil
Sample size: 1.6 x 1.5 x 1.2 cm (top), 2.0 x 1.3 x 0.8 cm (largest) (2nd/3rd/bottom row)
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

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