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Mineral identification
  
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indigo08




Joined: 09 Oct 2018
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PostPosted: Oct 09, 2018 05:48    Post subject: Mineral identification  

Hello,

Having found this beautiful sample on a flea market without a name or deposit (as is often the case), would there be someone who could give me more information?

The inside of the crystal is translucent azure blue and the outside is greenish to dull blue.

In the geode there are quartz crystals.

Thank you.



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20181009_114845.jpg
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Bob Harman




Joined: 06 Nov 2015
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PostPosted: Oct 09, 2018 07:03    Post subject: Re: Mineral identification  

WELCOME INDIGO 08,

I have never seen anything quite like that. Of course it would be nice knowing exactly where the specimen was found. Anyway, I would not be at all surprised to find that it is not all natural. Just maybe the blue color was added???

First I would wash the rock or soak it for an hour or so to see if the blue color washes off. I might very briefly (5 seconds at most) soak with vinegar or acetone (polish remover), then rinse, also to see if the blue color washes off or is real.

If the blue color seems real after the above, it might be a copper mineral, but I have my doubts. You would have to do some further testing like hardness, streak etc, as described in the identification section of the website. At this point I just don't know BOB
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Susan Robinson




Joined: 05 Aug 2010
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PostPosted: Oct 09, 2018 07:12    Post subject: Re: Mineral identification  

It looks to me like an artificiallly grown chalcanthite crystal. Its surface, over time, is changing due to the environment it which is has been stored.
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John Betts




Joined: 07 Jun 2012
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PostPosted: Oct 09, 2018 07:18    Post subject: Re: Mineral identification  

Susan Robinson wrote:
It looks to me like an artificiallly grown chalcanthite crystal. Its surface, over time, is changing due to the environment it which is has been stored.


I agree with Susan. When I saw the photos I recognized it as familiar but couldn't place it. She got it.

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Joseph D'Oliveira




Joined: 29 Jan 2012
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PostPosted: Oct 09, 2018 09:24    Post subject: Re: Mineral identification  

I think you're spot on Susan, it was the first thing that came to mind when I saw the pictures.
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lluis




Joined: 17 Nov 2006
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PostPosted: Oct 09, 2018 11:19    Post subject: Re: Mineral identification  

Hi, all

I agree that it looks as man-made.
But I have grown chalcantite crystals and as far as I remember that have not this shape...
Simply, they are slender and with many biselated faces in what we could call prism faces,.
Nor or them are here...
So, I doubt chalcantite,
I agree in man-made (and if colored, so many possibilities... :-( )
With best wishes

Lluís
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