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Unknow from Alzen (France )

Posted by Jean Marie Laurent  
avatar Unknow from Alzen (France )
May 14, 2008 01:21PM
fr    
Hello all !
Inknow blue/green reticular crystals founded on the dumps of old copper mine (Alzen, Ariège, Midi Pyrénées, France ). Associated with malachite, azurite, tetrahedrite.
Dissolves in HCl.
May be aurichalcite ?
What is your opinion? thanks in advance.

Jean-Marie
Attachments:
open | download - inc2 alzen.JPG (229.2 KB)
avatar Re: Unknow from Alzen (France )
May 14, 2008 01:22PM
fr    
Other view
Attachments:
open | download - inc alzen.jpg (255.5 KB)
avatar Re: Unknow from Alzen (France )
May 14, 2008 01:23PM
fr    
And the last one
Attachments:
open | download - inc1 alzen.JPG (260.8 KB)
avatar Re: Unknow from Alzen (France )
May 14, 2008 02:28PM
de    
Does it just dissolve in HCL, or does it also give off a gas ?
Re: Unknow from Alzen (France )
May 14, 2008 02:41PM
at    
Devilline? Langite? Wroewolfeite?
avatar Re: Unknow from Alzen (France )
May 14, 2008 03:53PM
fr    
Dissolves with effervescence...gas : yes,just a little.
Best regards.

Jean-Marie
Re: Unknow from Alzen (France )
May 15, 2008 02:23PM
us    
Blue-green, acicular, dissolves in HCl with CO2 generated: most probably aurichalcite.
Re: Unknow from Alzen (France )
May 15, 2008 02:27PM
at    
"gas : yes,just a little."

Sometimes trapped air bubbles in porous aggregates can mislead.
It would be good to test a definite aurichalcite for comparison purposes.
Dilute acids work better for such tests on easily soluble minerals.
avatar Re: Unknow from Alzen (France )
May 19, 2008 10:40AM
fr    
Uwe OK, I'll follow your instructions. The results in a few days.
Regards

Jean-Marie
avatar Re: Unknow from Alzen (France )
May 21, 2008 04:52PM
fr    
I made a second test.
The unknown is placed on the aurichalcite, so there is effervescence with HCl, normal !
But the crystals blue / green are not dissolved by this acid. So I think it is langite. There is a same photo from Padern- France ( ID 43811, Photo : Jacques Valverde ).
Another indication, the dumps are very wet and this crystals are always on the surface of the matrix.
So...langite ?

Jean-Marie
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