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 Post subject: Cobalt Irradiated Fluorite?
PostPosted: Mon Oct 19, 2009 1:06 pm 
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:?: this morning, while attempting to wake up and thaw out from freezing temps, i watched jewelry television. they were hosting fluorite on the show, beautiful stones, but the host mentioned the stones were cobalt irradiated? i wondered why and if anyone could share anything on this.

i googled it to see if i could find anything, lol, the only thing i could find was information on fluorite and teeth care. :lol:


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PostPosted: Mon Oct 19, 2009 1:14 pm 
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look on it from the bright side: at least they are disclosing stuff now... :?

I know nothing about fluorite treatments at all to be honest, can't remember being taught about any irradiation treatments on 'm eighter...

What was the color(s) of those stones they were selling?


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PostPosted: Mon Oct 19, 2009 1:29 pm 
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the one i saw was a beautiful deep blue fluorite. i did zip right over to jtv's website, and it appears that most of them which are cobalt irradiated are from china. there are some which are a pale green and bluish-green (intense). also noted that some of the fluorite from china are trademarked as "Kadenze." ? kadenze is a trademarked specialty cut from jtv, which they do have some beautifully cut flourite.


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PostPosted: Mon Oct 19, 2009 2:28 pm 
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I personally don't consider fluorite acceptable for use as a wearable gem. While it can be beautiful, it's far too soft and prone to cleaving and I'd never offer it to my customers except as specimen material.

But to answer the question, I'm pretty sure the "cobalt" in question refers to Cobalt 60 gamma irradiation as mentioned in this JCK article (scroll down to just below the images to the discussion of Brazil's Embrarad where fluorite irradiation is referenced).

http://www.jckonline.com/article/293899-JCK_Web_Feature_Brazil_Boasts_Local_Treasures.php

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PostPosted: Mon Oct 19, 2009 3:45 pm 
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:? is weird why irradiate fluorite?
people can buy 1 kg for less than 50$
why so much work for cheap material ....
realy don´t got it


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PostPosted: Mon Oct 19, 2009 3:50 pm 
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:lol: me either, pedro. thanks for the link to the jck article, rick! i wondered why bother with treating a stone as such, especially one that all you have to do is "look at it," and it may scratch it. :wink: beautiful brazilian stones in the article, too!! especially the imperial topaz and fire opal. :shock:


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PostPosted: Mon Oct 19, 2009 3:55 pm 
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Here is a irradiated Flourite. Been on sale for several years at this website:

http://www.mtlilygems.com/fluorite/fluor529.html

Image

From New Hampshire. For more info click on website link.

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PostPosted: Mon Oct 19, 2009 4:02 pm 
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8) thanks, big e!! that is a beautiful fluorite. jtv had a few similar to that color-quite intense, eh? :wink: i had never heard of fluorite being treated (irradiated) before this morning; and you mention it has been irradiated for years. it is a nice collector's stone, although i have seen it set in jewelry pieces before, mainly in pendants. but, i would be worried about scratching it.


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PostPosted: Fri Oct 23, 2009 5:44 pm 
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Fluorite is a fragile mineral, it hates brutal temperature changes (causes tiny cracks -cleavage- and loss of lustre ensue, color loss may also occur), also as a low hardness mineral it will easily get scractched (notably during extraction).
For that reason, many fluorite mineral specimens (crystals) are oiled before sale, so to hide the scratches and revive the lustre.
But to my knowledge this is the only recurrent fluorite treatment.
It is not much expensive (not big market for this gem I think, due to its fragility), and good specimens are found in many beautiful colors all around the world, so I don't think people are getting involved in 'heavy' treatments for that stone.


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 Post subject: Re: Cobalt Irradiated Fluorite?
PostPosted: Mon Nov 30, 2009 6:42 am 
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Hi ,

I am named Mauricio Favacho, our company CBE-Embrarad in Brazil treat a lot of gemstone using cobalt-60 gamma irradiation process, green and blue fluorites is one of those that is used for treating, beyond tourmalines, quartz, beryls, spodumenes (kunzites) and so on. For more information access our site or send me a email.

Sincerely

www.cbesa.com.br
mfavacho@cbesa.com.br

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PostPosted: Mon Nov 30, 2009 11:41 am 
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Actually, why don't you supply us with more information through the forum, in English.
What gems are you treating?
Do you have before and after pictures?
Describe the techniques.

Thanks


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PostPosted: Mon Nov 30, 2009 12:35 pm 
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he claims that his interprise is the bigger on latin america who sterelise things. it was a fusion between to big companies.
they offer services like desinfestations ,sterilizations for hospitals and food reducing patogenic agents. they nuke precious stones to.
they offer a lot of services.
they claim that they are recomended by a lot of organizations
like oms,national commission of nuke energy,onu, u.s department of agriculture etc.
this are not my words but theyr interprise i don´t represent anything.
on site there are not specification about what kind of gemstones his interprises irradiates.methods seems using shortwaves generated by by sealed sources of of cobalt 60.
seems that only him can explain that.
bem vindo ao forum gemology online :)


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PostPosted: Mon Nov 30, 2009 2:18 pm 
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Would LOVE to hear more from Mauricio on the irradiation process too.


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PostPosted: Fri Dec 04, 2009 7:49 pm 
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Faceted fluos are also pretty boring... add to all the above mentioned drawbacks: low RI, low dispersion and a so-so luster (at least after a while).

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PostPosted: Fri Dec 04, 2009 8:03 pm 
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Treated fluorite has been around for a while in multiple colors, I think I even saw "color change" fluorite. After cutting one natural fluorite and having it chip in the gem box I pretty much gave up on the material.

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