[Rockhounds] Re: Rockhounds Digest, Vol 50, Issue 12

[Doug Leeper]

If you have a piece of this calcite that does this that you can part with, I 
can obtain a very accurate response in the visible spectrum, possibly that 
may show the source?

I'm thinking like emission lines you get from various elements...

I have sources with 365nm, 290nm, 390nm, and 460nm dominant wavelengths I 
could stimulate it with.


----- Original Message ----- 
From: <rockhounds-request at lists.drizzle.com>
To: <rockhounds at lists.drizzle.com>
Sent: Friday, July 11, 2008 6:01 PM
Subject: Rockhounds Digest, Vol 50, Issue 12


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> [Rockhounds-Digest]
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> Today's Topics:
>
>   1. RE: REE, calcite, and lost and hidden secrets of the
>      stones... (Axel Emmermann)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 12 Jul 2008 00:45:32 +0200
> From: "Axel Emmermann" <axel.emmermann at pandora.be>
> Subject: RE: [Rockhounds] REE, calcite, and lost and hidden secrets of
> the stones...
> To: "'Rockhounds at drizzle.com: A mailing list for rock and gem
> collectors'" <rockhounds at lists.drizzle.com>
> Message-ID: <000b01c8e3a7$d3470670$6401a8c0 at AxelHP>
> Content-Type: text/plain;charset="us-ascii"
>
> Hi Pete & all.
>
> I wrote:
>> If I  remember correctly it 's cerium(/lead?) +
>> manganese/lead that cause  the pink fluorescence in long wave
>> UV and cerium =>europium that are  responsible for the blue
>> phosphorescence in short  wave.
>
> And then you wrote:
>
>> And, Axel, I think you are going beyond anything that is
>> definitely known here.  Yes, it has been hypothesized that
>> europium is "probably" the cause  of the blue fluorescence
>> and phosphorescence, but that's about it I think, as  far as
>> real knowledge.
>
> And then I write again:
> Absolutely. I know remember that I read about Glen Waychunas having
> researched this type of material and I believe that the conclusion was
> indeed a "probable" or something along those lines. It was also a slip of
> the keyboard ;-)) I should have phrased it more like "If I  remember
> correctly it 's BELIEVED TO BE cerium(/lead?) + manganese/lead etcetera...
> I beg extensive pardons from everybody all over the place. I'm usually 
> more
> careful.
>
>>Other minerals that fluoresce due to
>> europium (such  as
>> fluorite) fluoresce LW rather than short,
>
> Yes, but wasn't there something said about the blue fluorescence actually
> NOT being fluorescence but phosphorescence caused by energy transfer
> (electrochemically) between cerium and europium?
> You can actually see the ph coming up if you flash a SW light over a
> TT-calcite. Short pink burst and then it turns blue. I have REE-doped
> ceramics that behave the same way but slower (red-pink to blue over a 
> period
> of several seconds).
>
>> and do not
>> phosphoresce; and Mn/Pb produces the common red/orange fl. in
>> calcite, but that's quite unlike the pink  LW of
>> Terlingua-type calcite.
>
> Not if you shine a REALLY REALLY LW source on it. Under 390 nm all my
> TT-calcite glows orange red... The shorter the wavelength the stronger the
> blue PH gets. At 350 nm you get a few specimens that fluoresce 
> straw-yellow
> to pink and at 320 nm some specimens are nearly white.
>
>> So I still think everybody is just
>> guessing at this.  I know a few people have played around
>> with some research on  this, but I don't think anything
>> formal or conclusive has ever been published--again, I'd LOVE
>> to know that I am wrong, and I would love it if  anyone could
>> direct us to any actual published articles giving hard data
>> about  this type of calcite!
>
> Yeah, I'd love to know too ;-)))
>
> Cheers
> Axel
>
>
>
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> End of Rockhounds Digest, Vol 50, Issue 12
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