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DanovskiM
Joined: 15 Mar 2025
Posts: 33
Location: Beauvais
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 Posted: Mar 31, 2025 12:26 Post subject: Help , please, with locality |
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Hello,
Please help me for identification of the mineral on the copper if it possible. My initial thought was calcite, but any help with correct identification and locality information would be appreciated. I have this one from a local exchange with a collector, who said that he is from Michigan, USA.
Thanks in advance
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4248
Location: Germany
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| Posted: Apr 01, 2025 07:37 Post subject: Re: Help , please, with locality |
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| DanovskiM wrote: | | Hello, Please help me for identification of the mineral on the copper if it possible. My initial thought was calcite, but any help with correct identification and locality information would be appreciated. I have this one from a local exchange with an collector, who said mi that he is from Michigan, USA. Thanks in advance |
I think both your initial thought and the locality information were right, this is most likely a specimen from Michigan and the white mineral is most likely calcite.
Regards
Tobi
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Kevin Schofield
Joined: 05 Jan 2018
Posts: 170
Location: Beacon NY
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| Posted: Apr 01, 2025 09:46 Post subject: Re: Help , please, with locality |
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looking at your photograph in detail, the associated mineral doesn't look like calcite unless it has been very etched (which is possible given that the copper has had its patina removed). The greenish colour and general form suggests to me that it may be prehnite, which is another fairly common association with copper from Michigan.
A simple acid test (bubbles if it is calcite, none if it is prehnite), or a scratch test with a steel blade (will scratch calcite, will not scratch prehnite) will tell you.
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DanovskiM
Joined: 15 Mar 2025
Posts: 33
Location: Beauvais
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| Posted: Apr 06, 2025 15:01 Post subject: Re: Help , please, with locality |
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Many thanks for your answers. I'll be trying some weekend with acid and lame.
Regards
Martin
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