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Atacamite?
  
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Mathias




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PostPosted: Jun 19, 2018 02:04    Post subject: Atacamite?  

I bought this specimen some years ago as Atacamite, Chile.
But somehow the crystals don't look like most other Atacamite specimens from this locality.
Any clues if this is Atacamite or some other mineral?
Thanks
Mathias



112B.JPG
 Mineral: Atacamite?
 Locality:
Atacama Region, Chile
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lluis




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PostPosted: Jun 21, 2018 03:55    Post subject: Re: Atacamite?  

Hi, Mathias

I would say that it is clinoatacamite...
But without an analysis....

With best wishes

Lluís
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Jordi Fabre
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PostPosted: Jun 30, 2018 14:08    Post subject: Re: Atacamite?  

I tend to agree with Lluís but it could be also Malachite.
You can do an easy test by checking if a small fragment of the green crystals dissolves after a while in vinegar or in dilute HCl
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Mathias




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PostPosted: Jul 01, 2018 02:44    Post subject: Re: Atacamite?  

Hi Thanks for your answers.

I could put it in the XRF, if there's no chlorine detected, that it isn't Atacamite or Clinoatacamite.

I'd rather not damage the specimen.

Thanks,
Mathias
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