Category:Native silver-copper mass

Subcategories

This category has only the following subcategory.

Media in category "Native silver-copper mass"

The following 3 files are in this category, out of 3 total.

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  Copper-silver "halfbreed" (Mesoproterozoic, 1.05-1.06 Ga; Keweenaw Peninsula, northern Michigan, USA) (16691554394).jpg 2,653 × 1,420; 1.94 MB
  
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  Silver and copper (Mesoproterozoic, 1.05-1.06 Ga; Upper Peninsula of Michigan, USA) (17283607002).jpg 2,341 × 1,824; 4.06 MB
  
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  Silver-copper mass (Mesoproterozoic, 1.05-1.06 Ga; Central Mine, Ontonagon County, Upper Peninsula of Michigan, USA) 2 (17269160212).jpg 2,549 × 1,819; 2.48 MB