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Rhodochrosite Argentina
  
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Mathias




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PostPosted: May 18, 2019 11:48    Post subject: Rhodochrosite Argentina  

Another specimen with questions…..

This is a rather big specimen, labeled "Rhodochrosite, San Luis, Argentina, 1954.

It is hard to find comparable specimen on Mindat, almost only polished slices.
San Luis is a Province, which location could this specimen be coming from?
Does it come from a mine? Or from a cave?

Is this the type of stone from which these slices are cut?

The specimen is 45 cm * 25 cm * 15 cm, and weights approximately 15 kilo.
Another question; how can I display this specimen? Mounting it on an acrylic stand using hot melt glue is not possible.

Thanks,
Mathias



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Peter Perkins




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PostPosted: May 18, 2019 12:01    Post subject: Re: Rhodochrosite Argentina  

I like the Crinoidal limestone (probably Carboniferous age) of your table top. [The rhodochrosite reminds me of what I collected from Trepca mine]
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Mathias




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PostPosted: May 18, 2019 12:12    Post subject: Re: Rhodochrosite Argentina  

Peter Perkins wrote:
I like the Crinoidal limestone (probably Carboniferous age) of your table top. [The rhodochrosite reminds me of what I collected from Trepca mine]


Thanks Peter, actually, that is my veranda floor....
Looks as if it has fossils in it, but all patterns are rather vague...

No clear fossil structures.
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Kevin Conroy




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PostPosted: May 18, 2019 16:48    Post subject: Re: Rhodochrosite Argentina  

You may find this interesting:
https://pubs.geoscienceworld.org/minmag/article/82/S1/S61/533165/enrichment-in-critical-metals-in-ge-and-te-se-in
(link normalized by FMF)

As to displaying it, there are a few options if you want a stand. A thick acrylic stand can have a custom "hole" etched out so the specimen sits securely in it. You could also build an "L-shaped" wooden stand that should do the trick, and if you care to carve a custom hole.
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Mathias




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PostPosted: May 19, 2019 04:26    Post subject: Re: Rhodochrosite Argentina  

Thanks for the information, it requires some knowledge of Chemistry to make it understandable, but shouldn't be the problem as a chemical technologist, be it 30 years ago....


Regarding the Rhodo; it is actually that heavy because it is a coating on massive pyrite.

Thanks,

Mathias



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Kevin Conroy




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PostPosted: May 19, 2019 08:35    Post subject: Re: Rhodochrosite Argentina  

No worries on the link. The main thing for me was the information about the locality, and the mineral associations. Since yours has the pyrite association I would think that the La Carolina District is definitely a possibliliy for its origin.
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condoragatemines




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PostPosted: May 22, 2019 15:25    Post subject: Re: Rhodochrosite Argentina  

I don't think that specimen came from San Luis Province, Argentina.
There are not report of any Rhodochrosite material from that province ever.
Rhodochrosite from Argentina came exclusively from Andalgala Mine in Catamarca Province, Argentina.
Also you can get some Rhodochrosite material from Peru, and Colorado state in USA
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Tobi




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PostPosted: May 23, 2019 01:17    Post subject: Re: Rhodochrosite Argentina  

I'm not an expert on minerals from Argentina, but I have never seen something like that from that country. Am I the only one who thinks that this specimen totally looks like one from Oppu Mine in Japan ...?
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Jordi Fabre
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PostPosted: May 23, 2019 02:57    Post subject: Re: Rhodochrosite Argentina  

I would say Capillitas Mine, Andalgalá Department, Catamarca. The piece has a kind of stalactitic form and Capillitas gives a lot of different styles of Rhodocrosite.
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Kevin Schofield




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PostPosted: May 23, 2019 10:21    Post subject: Re: Rhodochrosite Argentina  

Tobi wrote:
I'm not an expert on minerals from Argentina, but I have never seen something like that from that country. Am I the only one who thinks that this specimen totally looks like one from Oppu Mine in Japan ...?


Tobi...I just got to this thread, and You Are Not Alone! This looks very much like Oppu, particularly with the sulphide association, which I have never personally seen on any of the Argentinian stalactitic pieces.

If that is the case Mathias, you have a rather fine specimen and, I suspect, got it at a bit of a bargain!

Kevin

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Mathias




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PostPosted: May 23, 2019 12:58    Post subject: Re: Rhodochrosite Argentina  

Hi Kevin thanks,
Yes, if it is Oppu mine, then it was a bargain.
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