Unknow from Alzen (France )

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

Other view

And the last one

Does it just dissolve in HCL, or does it also give off a gas ?

Devilline? Langite? Wroewolfeite?

Dissolves with effervescence...gas : yes,just a little.
Best regards.

Jean-Marie

Blue-green, acicular, dissolves in HCl with CO2 generated: most probably aurichalcite.

"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.

Uwe OK, I'll follow your instructions. The results in a few days.
Regards

Jean-Marie

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