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Tsumeb specimen.
  
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Heimo Hellwig




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PostPosted: Dec 27, 2016 10:19    Post subject: Tsumeb specimen.  

Once again Tsumeb bowled me over!!

On 26 August 2014 I posted pictures of the specimen which is represented by the first two pictures below. I gave the minerals as Malachite on Calcite.

The following two pictures were photographed on page 154 of the Krüger-Stiftung Edition of Namibia Minerals and Localities 2. Here the minerals are given as Conichalcite on Dolomite.

These two specimen, to me, really are the same minerals.

If my conclusion is correct, could the information of my first post (HH 824 A and HH 824 B) on page 1 of my collectors division please be rectified.

Thank you and kind regards.



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Peter Megaw
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PostPosted: Dec 27, 2016 10:47    Post subject: Re: Tsumeb specimen.  

I'll buy the dolomite vs calcite, but that's a weird habit for conichalcite. Based on morphology I think your malachite ID may be correct and if these are the same find, the conichalcite ID is wrong.

Malachite is readily soluble in HCl, while conichalcite is not. I would take a few fibers off one of the damaged green spheres and see if it dissolves ....the acid will quickly turn green if it does .

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Graham Harrison




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PostPosted: Dec 27, 2016 11:04    Post subject: Re: Tsumeb specimen.  

I am pretty sure this is malachite on calcite. The calcite is probably a 2nd phase development on the original dolomite. Little malachite spheres like these were not uncommon on calcite from the mine. Still a lovely specimen.
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Graham
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Heimo Hellwig




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PostPosted: Dec 27, 2016 14:16    Post subject: Re: Tsumeb specimen.  

Peter, Graham, thank you very much for your expert opinion.
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Heimo Hellwig




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PostPosted: Dec 28, 2016 10:17    Post subject: Re: Tsumeb specimen.  

Peter Megaw wrote:
I'll buy the dolomite vs calcite, but that's a weird habit for conichalcite. Based on morphology I think your malachite ID may be correct and if these are the same find, the conichalcite ID is wrong.

Malachite is readily soluble in HCl, while conichalcite is not. I would take a few fibers off one of the damaged green spheres and see if it dissolves ....the acid will quickly turn green if it does .


Hello Peter, I did the acid test and it confirmed your and Graham's conclusion as to the Malachite.

Thanks again and regards.
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