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Calcite Location
  
  Index -> What is it? - Where is it from?
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Vitomorim




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PostPosted: May 27, 2017 17:48    Post subject: Calcite Location  

Hello everyone,

I bought this specimen very recently and the seller had doubts regarding its location; apparently, he had the specimen for a long time. I was told that this calcite was from Kansas, USA, but, after searching on mindat, I am starting to believe that this information is incorrect. In fact, I found very similar specimens from Iraí, Alto Uruguai region, Rio Grande do Sul, Brazil. What are your thoughts on the location? And by the way, what do you think the green mineral is? Celadonite is identified together with calcite specimens from Irai, Brazil, on mindat.

Many thanks



Calcite(1).jpg
 Mineral: Calcite
 Description:
 Viewed:  2050 Time(s)

Calcite(1).jpg



Calcite2(1).jpg
 Mineral: Calcite
 Description:
 Viewed:  2042 Time(s)

Calcite2(1).jpg


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Montanpark




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PostPosted: May 27, 2017 17:58    Post subject: Re: Calcite Location  

Hi,
if the matrix is volcanic basaltoid rock i´d go for Brazil too. But calcite is really abundant worldwide so one needs more diagnostic features. Can you take a picture of the martix?
Cheers
Roger
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Montanpark




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PostPosted: May 27, 2017 17:59    Post subject: Re: Calcite Location  

Can you ID the green stuff as malachite or other copper secondary? Then not Irai. If it is chlorite or similar - still need the matrix.
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Bob Harman




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PostPosted: May 27, 2017 18:18    Post subject: Re: Calcite Location  

As has been mentioned, calcite localities are so ubiquitous that a definite origin may be difficult to identify. But, because of the associated greenish mineral, it does not look like any Kansas or Midwest USA calcite in general that I have ever seen. Without any evidence of the greenish mineral, I suppose a case could be made for one of the Kansas or Missouri mining districts, but with that greenish mineral no way.
BOB
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Pete Richards
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PostPosted: May 27, 2017 18:26    Post subject: Re: Calcite Location  

Thank you for showing us your face! I like that.

While considering the identity of the green mineral is important (and I doubt that it is a copper secondary), it might also be worth asking what the smaller translucent crystals are that make up the background for the main cluster of calcite crystals. Are they also calcite?

Most of the material that I am familiar with from that region of Brazil and from Argentina is mostly amethyst, though of course the market will favor such specimens and be less interested in ones that lack purple crystals. Or maybe they are just less common.

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Montanpark




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PostPosted: May 27, 2017 19:01    Post subject: Re: Calcite Location  

Pete,
i encountered quite some Irai specimens and it is definitely an option. I agree strongly that knowing what the smaller xls are (i think they look like cannon spar) is crucial too. But the green stuff if chlorite/celadonite is common with the Irai specimens which don´t really "need" quartz as base. Just handled some hundred calcite specimens for our calcite special exhibition so i read and saw a lot of calcite worldwide and that is still fresh and very present in my mind although i am far from being a calcite specialist of course ;-). I try to ask my very knowledgeable calcite collectors if i can get them. A nice specimen BTW
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Roger
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Jim Robison




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PostPosted: May 27, 2017 19:02    Post subject: Re: Calcite Location  

Even not knowing the location, it is a very pretty and nice calcite specimen. You have a good eye. The matrix (material on the back side) may sometimes be hard to find, as it is not uncommon for thin plates of minerals to pop off the underlying rock. Are there at least traces of some rock if that has happened here? I've also seen many specimens from Irai that don't have visible matrix, and that would be my first guess, but as noted above, nice calcite specimens are found all over the world, so it may not be possible to pin this one down. Good piece regardless.
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Montanpark




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PostPosted: May 27, 2017 19:03    Post subject: Re: Calcite Location  

... forgot: a picture of the backside would be really helpful (matrix)
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Montanpark




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PostPosted: May 27, 2017 19:04    Post subject: Re: Calcite Location  

Jim Robison wrote:
Even not knowing the location, it is a very pretty and nice calcite specimen. You have a good eye. The matrix (material on the back side) may sometimes be hard to find, as it is not uncommon for thin plates of minerals to pop off the underlying rock. Are there at least traces of some rock if that has happened here? I've also seen many specimens from Irai that don't have visible matrix, and that would be my first guess, but as noted above, nice calcite specimens are found all over the world, so it may not be possible to pin this one down. Good piece regardless.


Jim, full ack. Good to "see" you here. Hope you are fine :-)
Cheers
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Pete Richards
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PostPosted: May 27, 2017 19:11    Post subject: Re: Calcite Location  

Montanpark wrote:
Pete,
i encountered quite some Irai specimens and it is definitely an option. I agree strongly that knowing what the smaller xls are (i think they look like cannon spar) is crucial too. But the green stuff if chlorite/celadonite is common with the Irai specimens which don´t really "need" quartz as base. Just handled some hundred calcite specimens for our calcite special exhibition so i read and saw a lot of calcite worldwide and that is still fresh and very present in my mind although i am far from being a calcite specialist of course ;-). I try to ask my very knowledgeable calcite collectors if i can get them. A nice specimen BTW
Cheers
Roger

Thanks, Roger. It does not surprise me that plates of entirely calcite would come from that region, though I had not seen them. I agree that the chlorite/celadonite does not in any way depend on amethyst. Thanks for adding your experience!

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Joseph D'Oliveira




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PostPosted: May 27, 2017 21:22    Post subject: Re: Calcite Location  

Here is my Irai piece, thin plate with calcite and celadonite/chlorite. the matrix is only .5mm thick and is probably a volcanic covered with the celadonite/chlorite. Hope that helps.


Vitomorim wrote:
Hello everyone,

I bought this specimen very recently and the seller had doubts regarding its location; apparently, he had the specimen for a long time. I was told that this calcite was from Kansas, USA, but, after searching on mindat, I am starting to believe that this information is incorrect. In fact, I found very similar specimens from Iraí, Alto Uruguai region, Rio Grande do Sul, Brazil. What are your thoughts on the location? And by the way, what do you think the green mineral is? Celadonite is identified together with calcite specimens from Irai, Brazil, on mindat.

Many thanks



calcite1_452.jpg
 Locality:
Iraí, Alto Uruguai region, Rio Grande do Sul, Brazil
 Dimensions: 13x7x2 cm
 Description:
 Viewed:  1911 Time(s)

calcite1_452.jpg



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Vitomorim




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PostPosted: May 28, 2017 06:58    Post subject: Re: Calcite Location  

Thank you all for your feedback. The calcite crystals are on a thin plate covered in the green material. Regarding the smaller crystals, I believe they are also calcite. I also noticed that in some regions the green material is powdery while in others it is crystallized, meaning that two different minerals could be present.


DSC_0161.JPG
 Description:
Side view of the thin plate.
 Viewed:  1805 Time(s)

DSC_0161.JPG



DSC_0159.JPG
 Description:
Back side
 Viewed:  1806 Time(s)

DSC_0159.JPG



DSC_0160.JPG
 Description:
Back side
 Viewed:  1809 Time(s)

DSC_0160.JPG



DSC_0158.JPG
 Description:
Middle green mineral is crystallized (with a powdery center), while in the right the material is powdery.
 Viewed:  1807 Time(s)

DSC_0158.JPG



DSC_0157.JPG
 Description:
Smaller crystals.
 Viewed:  1813 Time(s)

DSC_0157.JPG


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Tobi




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PostPosted: May 28, 2017 07:14    Post subject: Re: Calcite Location  

According to the last pictures, I'm quite sure that your calcite is from Irai, Brazil.
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Vitomorim




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PostPosted: May 31, 2017 11:24    Post subject: Re: Calcite Location  

Thank you Tobi for the clarification.
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