Wyllieite

  
Origin: Halsjoberg, Varmland, Sweden
Sample size: 5.7 x 2.8 cm specimen of quartzite with a large zone of blue wyllieite mineralization
 

Photo courtesy of: 

John Veevaert, Trinity Mineral Co

Trinityminerals.com

 

  
Black, massive. This mine is now Custer's (South Dakota) garbage dump - don't look for much of this material on the market. Ex. Grenier Collection
  
Black and massive along with tanish yellow sheets of muscovite. Ex. Erling Collection
  
Origin: Victory Mine, Custer Co., South Dakota, United States
Sample size: 8 x 6 x 5 cm (top), 7 x 4 x 4 cm (2nd row), 6 x 5 x 4 cm (bottom)
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

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