Pekoite

Grey-metallic grain in quartz with chalcopyrite
Origin: Falungruva, Dalarna, Sweden
Sample size: micromount
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

  
Grey acicular crystals in quartz associated with gladite.
Origin: Comstock mine, Dos Cabezos Mountains, Cochise Co., Arizona, United States
Sample size: 2.5 x 2.5 x 2 cm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

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