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Eduardoo
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Posted: Aug 25, 2010 12:47 Post subject: How to display Copper? |
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Dear Friends:
I got this nice chunk of copper, should I clean it or leave as is for display?
I know it is a sin to clean a coin, and cleaned coins are less valuable. What about minerals?
If it should be cleaned, what is the best way to clean copper?
Regards,
Eduardo
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Cooper, Perú, 25cm, front. |
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![Cobre front.jpg](files/cobre_front_351.jpg)
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Cooper, Perú, 25cm, back. |
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![Cobre back.jpg](files/cobre_back_122.jpg)
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GneissWare
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Posted: Aug 25, 2010 12:59 Post subject: Re: How to display Cooper |
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You will see many cleaned (acid dipped) coppers available for sale. But, once it is cleaned, you loose the patina of the copper and the associated secondary minerals. Once cleaned, you can't restore it.
I tend to not chemically clean coppers. Ultrasonic cleaning is fine for me, but I don't like the bright copper look.
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Jordi Fabre
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Eduardoo
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Posted: Aug 25, 2010 17:52 Post subject: Re: How to display Copper? |
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Thanks for your comments. I actually find the green rust quite appealing, so I will just leave the piece alone.
BTW, I am not sure wether my piece is massive or crystalized Copper (I have never seen Copper crystals before), I would appreciate your comments.
Regards,
Eduardo.
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John S. White
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Posted: Aug 26, 2010 07:17 Post subject: Re: How to display Copper? |
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Eduardo:
It is a little difficult to tell absolutely from a photo, but your copper does not appear to exhibit crystal forms. On one side it looks like platy copper that has been precipitated between pebbles in a conglomerate or fragments in a breccia. If you do not understand these terms, you can find good definitions on Wikipedia. My guess is that this is massive copper.
Do not forget that when submitting such questions, it is important to provide as much information as you can. You did not tell us where the copper is from, what locality? If you don't know the exact locality, you might at least know the country where it was found. Even that could help.
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Les Presmyk
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Posted: Aug 26, 2010 09:43 Post subject: Re: How to display Copper? |
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My first impression was that this specimen may actually be a smelter product. In which case, using the various cleaning methods will be fine.
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Eduardoo
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Posted: Aug 26, 2010 12:37 Post subject: Re: How to display Copper? |
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Hi John:
Here are two close-ups of the Copper. Maybe that would help to determine if there are crystals.
The Copper is from Perú.
Regards,
Eduardo.
Description: |
Copper, Perú, Close-up 1. |
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![Copper det1.jpg](files/copper_det1_177.jpg)
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John S. White
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Posted: Aug 26, 2010 12:59 Post subject: Re: How to display Copper? |
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Really hard to say. I am waiting for Alfredo to weigh in on this one.
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Les Presmyk
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Posted: Aug 26, 2010 15:51 Post subject: Re: How to display Copper? |
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Can you take a similar close-up of the other side?
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Eduardoo
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Posted: Aug 26, 2010 16:13 Post subject: Re: How to display Copper? |
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Sure, this is the back.
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![Copper det-back.jpg](files/copper_det_back_389.jpg)
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Les Presmyk
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Posted: Aug 26, 2010 18:06 Post subject: Re: How to display Copper? |
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I still question whether it is natural or something resulting from molten copper from a smelter or other refining process.
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Jordi Fabre
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Posted: Aug 27, 2010 01:56 Post subject: Re: How to display Copper? |
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Eduardoo wrote: | ...BTW, I am not sure wether my piece is massive or crystalized Copper (I have never seen Copper crystals before |
Here you have two different examples of crystallized Copper.
Description: |
Copper with Cuprite Itauz Mine, Dzhezkazgan, Kazakhstan Mined in September 2003 Specimen size: 4 × 2 × 0.8 cm. Photo from: "Reference Specimens" |
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![Copper with Cuprite - Itauz Mine - Dzhezkazgan - Kazakhstan.jpg](files/copper_with_cuprite__itauz_mine__dzhezkazgan__kazakhstan_292.jpg)
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Copper with Cuprite Ray Mine, Ray district, Pinal County, Arizona, USA Specimen size: 6.5 × 6.2 × 1.5 cm. Former Folch collection Photo from: "Reference Specimens" |
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16897 Time(s) |
![Copper with Cuprite - Ray Mine - Arizona - USA.jpg](files/copper_with_cuprite__ray_mine__arizona__usa_179.jpg)
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Eduardoo
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Posted: Aug 28, 2010 10:50 Post subject: Re: How to display Copper? |
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My copper specimen looks a lot like this one: wwwdotjohnbetts-finemineralsdotcom/jhbnyc/gifs/48856dothtm
It is described as a hackly mass of copper, so I guess there are no crystals.
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GneissWare
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Posted: Aug 28, 2010 11:01 Post subject: Re: How to display Copper? |
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This is a pretty typical specimen of copper--its attractive and has a nice patina.
Crystallized copper is relatively rare, and commands higher prices. Lots of the copper from Michigan and even Arizona looks a bit like your specimen. Enjoy it..
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