Gillulyite

  
Large 9 mm dark sub-metallic red cleavage in calcite matrix with realgar (XRD confirmed)
Origin: South Mercur pit, Barrick Gold mine, Mercur, Tooele Co., Utah, United States (type locality)
Sample size: 7 x 6 x 4 cm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

  
Matrix hosting a very tiny patch of this rare mineral.
Origin: Lulu Cut, Level 6810 South Mercur Pit, Barrick Gold Mine, Mercur District, Tooele Co., Utah, U.S.A.
Sample size: 4.5 x 2.3 x 2.8 cm
 

Photo courtesy of: 

Dan Weinrich

Dealer in fine mineral specimens

 

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