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Spodumene color question
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Peter




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PostPosted: Oct 02, 2011 21:36    Post subject: Re: Spodumene color question  

Regarding red emerald I agree John, why not throw in the Ruby Emerald name, better and crazier. I call green beryl from Finland just that, green Beryl. Yes, in Finland
(Karelia Beryl Mine, to be correct the registered claim name is "Karelia Mine" and the Mining company "Karelia Beryl!") some are true golden color or real heliodore but most are not. There are some very strong green color also, very unusual color.
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cascaillou




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PostPosted: Nov 27, 2011 01:25    Post subject: Re: Spodumene color question  

Hi people :-)

Here's what I've been teached:

Green beryl is coloured by iron, emerald is coloured by chromium and/or vanadium

Green spodumene is coloured by iron, hiddenite is coloured by chromium.

The presence of chromium can be detected by gemmological tools such as spectroscope and chelsea filter.

I hope that helps.
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Barry Vincent




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PostPosted: Jun 05, 2013 21:26    Post subject: Re: Spodumene color question  

Recently I purchase a specimen of 'Hiddenite' Spodumene from that famous web site. It was from Pakistan and when it arrive it was a lovely emerald green colour.
Now, over a period of about 9 months it has a lovely clear colourless appearence.
Ah well, live and learn :)
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Peter




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PostPosted: Jun 06, 2013 01:05    Post subject: Re: Spodumene color question  

Although the color of some Afghan spodumene (in principle no spodumene is mined in Pakistan! although most Afghan specimens are sold in Peshawar, Afghanistan) can remind some people of these rare Hiddenites, that is all it is, a temporary similar color. Any Cr bearing and nicely green colored spodumene from anywhere I would call Hiddenite but until now I am not aware of a second region, not even in Brazil. Green spodumene I call green spodumene. Many of these varietal names comes from the gem trade.

Indigolite was discovered in the Li pegmatites in the Utö iron mine worked already by Vikings in the south Stockholm archipelago and described in 1801 if I recall correctly.

There it states the Indigo blue variety of tourmaline Indicolite in the English version which I think in fact is a simple miss-print at the time. It was discovered in Sweden and was always called IndiGolite in Sweden, Germany, France, Russia etc. but most often spelled indiColite in the English speaking world likely due to the 200 year old printing error!
Always take care not to expose some minerals like spodumene (except for real Hiddenite variety), realgar, crocoite, champagne colored topaz etc to strong sun light.
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Jordi Fabre
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PostPosted: Jun 06, 2013 01:56    Post subject: Re: Spodumene color question  

Barry Vincent wrote:
...a specimen of 'Hiddenite' Spodumene from that famous web site. It was from Pakistan and when it arrive it was a lovely emerald green colour.
Now, over a period of about 9 months it has a lovely clear colourless appearence...

Recommended reading: Preparing a list of light sensitive minerals - (14)
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Barry Vincent




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PostPosted: Jun 06, 2013 01:57    Post subject: Re: Spodumene color question  

Thank you Peter for your prompt reply to my comments concerning the 'colour changing' Spodumene. It was interesting to note that the Pakistani dealer mentioned that it was heat treated , but failed to mention that it is only temporary. So he was being 'half honest ;)
And yes, you are correct, the specimen is listed as originating from Afghanistan.
I had no problem with knowing that it was heat treated. It didn't cost all that much, being a large 'thumbnail' size specimen.
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Barry Vincent




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PostPosted: Jun 06, 2013 02:01    Post subject: Re: Spodumene color question  

Jordi Fabre wrote:
Barry Vincent wrote:
...a specimen of 'Hiddenite' Spodumene from that famous web site. It was from Pakistan and when it arrive it was a lovely emerald green colour.
Now, over a period of about 9 months it has a lovely clear colourless appearence...

Recommended reading: Preparing a list of light sensitive minerals - (14)

Hi Jordi. This particular Spodumene specimen of mine was never in strong sunlight. It went straight into my display cabinet. The cabinet has no installed lighting. The only light that enters the cabinet is from the room fluorescent lights.
Thank you for your reply anyway.
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