Duttonite

  
 
  
Brown micaceous micro crystals to maybe 0.1 mm interstitial amongst quartz grains in sandstone matrix.
Origin: Pandora mine, San Juan Co., Utah, United States
Sample size: 5 x 3 x 2 cm (top), 5 x 4 x 2.5 cm (bottom)
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

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