Manganotantalite

  
 
  
 
  
 
  
Origin: Ecuador, Minas Gerais, Brazil
Sample size: 10 x 6 x 5 cm, WEIGHT = 1014 grams (top), 14 x 8 x 7 cm, WEIGHT = 1515 grams (2nd row), 14 x 8 x 7 cm, WEIGHT = 4 pounds (approx) (3rd row), 15 x 10 x 7 cm, WEIGHT = 7 pounds (approx) (bottom)
 
Origin: Governador Valadares, Minas Gerais, Brazil
Sample size: 2.5 x 1.9 x 1 cm
 
  
  
 
  
Origin: Equador, Rio Grande do Norte, Brazil
Sample size: 8.2 x 7.3 x 4.3 cm (top/2nd row), 2.8 x 2.8 x 2.5 cm (3rd/bottom row)
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

  
 
Origin: Apache mine, Taos Co., New Mexico, United States
Sample size: 3.5 x 2 x 2 cm (top), 3.5 x 3 x 2.5 cm (bottom)
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

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