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Copper

Posted by David Von Bargen  
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Steven Kuitems February 21, 2011 12:06AM
David and Rock, perhaps you could ask Kevin Ward if he would be willing to share his photo of a spectacular crystalized Chimney Rock Quarry, NJ specimen with this article. It is a very good photo of a major copper specimen.
Steve.
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Rock Currier February 21, 2011 08:32AM
Steven,
The author of the Copper article is David Von Bargen and I think that I should probably not get involved at this point, but Dave is a reasonable guy and I bet if you asked Kevin, he would likely upload the image to the mindat gallery for use.

Rock Currier
Crystals not pistols.
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David Von Bargen February 21, 2011 02:53PM
Paul,
I think it may be more of a difference about the definition of halfbreed. Personally, I think of them as the "nuggets" with more than about 25% silver for a "classic" halfbreed. Specimens from the underground I would classify as a silver and copper specimen, not a halfbreed. I think that classifying a copper specimen with a spec of silver on it as a halfbreed is just marketing hype.

Silver is later in the paragenetic sequence as evidenced by the short range of diffusion of elements where the two metals are in contact.

http://www.minsocam.org/ammin/AM52/AM52_352.pdf
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