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Calcite green fluorescence activator
  
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Josele




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PostPosted: Jun 06, 2012 12:17    Post subject: Calcite green fluorescence activator  

Some days ago I discovered that a karstic calcite from an old Roman quarry that was used to built Baelo - Claudia (ancient Roman city in the coast of Tarifa, Cádiz, Andalousia, Spain) is highly fluorescent. The thing is that fluorescence is not pink as use to be in calcites but green, a bright green.
I have two questions, perhaps you can help me:
- How rare is green fluorescence in calcite? For me is something new, I have not seen this before.
- Which element can be the activator for this green fluorescence?
Comments will be very wellcome, thanks in advance.



C_rom2.JPG
 Description:
Karstic calcite on bioclastic sandstone and conglomerate
Roman quarry, Tarifa, Cádiz, Spain.
45 x 35 x 30 cm
Under natural light:
 Viewed:  11865 Time(s)

C_rom2.JPG



C_rom1.JPG
 Description:
Under LW UV LED:
 Viewed:  11858 Time(s)

C_rom1.JPG



C_11.JPG
 Description:
Karstic calcite on bioclastic sandstone and conglomerate
Roman quarry, Tarifa, Cádiz, Spain.
18 x 14 x 14 cm
Under halogen lamp:
 Viewed:  11853 Time(s)

C_11.JPG



C_12.JPG
 Description:
Under LW UV lamp:
 Viewed:  11847 Time(s)

C_12.JPG



C_15.JPG
 Description:
Karstic calcite on bioclastic sandstone and conglomerate
Roman quarry, Tarifa, Cádiz, Spain.
18 x 14 x 14 cm
Under halogen lamp:
 Viewed:  11880 Time(s)

C_15.JPG



C_16.JPG
 Description:
Under LW UV LED:
 Viewed:  11874 Time(s)

C_16.JPG



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GneissWare




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PostPosted: Jun 06, 2012 13:06    Post subject: Re: Calcite green fluorescence activator  

I think the companion thread on Mindat covers the issues:

https://www.mindat.org/mesg-11-262539.html

Uranyl or organic traces are most likely.

to quote from the Fluorescent Mineral Society website:

A common fluorescent is calcite. It comes in just about all fluorescent colors due to different activators. Red and pink fluorescent calcites are often activated by a team of lead and manganese. Calcite may fluoresce green due to uranyl ion traces. Calcite from the mercury mines at Terlingua, Texas, and just across the border into Muzquiz, Coahuila, Mexico, is a favorite. It fluoresces pink under longwave UV and bright blue under shortwave UV, with a uniquely bright blue phosphorescence after the UV lamp is removed.
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Josele




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PostPosted: Jun 06, 2012 13:35    Post subject: Re: Calcite green fluorescence activator  

GneissWare wrote:
I think the companion thread on Mindat covers the issues: ...


Thanks for your input. The reason I'm asking here is answers in Mindat were not very explicit (U or organic inclusions). U should be rare in this sedimentary media and I have not found many information about organic materia as fluorescence activator. My hope is perhaps somebody here can explain little bit more.

Also in Mindat nobody tells if is rare or not to find green fluorescent calcite. There is many caves with karstic calcite but I have not idea if they usually are fluorescent. Have you?

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GneissWare




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PostPosted: Jun 06, 2012 14:09    Post subject: Re: Calcite green fluorescence activator  

Given:
Calcite is not inherently fluorescent in pure form.
Its fluorescence is a function of trace contaminants.
Green fluorescence is due to organic compounds or uranyl ions.
Reddish fluorescence is due to lead and manganese.

Then:
As Mn and Pb are more abundant than U in most environments, I would expect green fluorescence to be less common than the reddish form.
Not knowing what kinds of organic compounds contribute to the greenish fluorescence makes a statement about them harder to speculate about. But, organic compounds are probably more prevalent in some environments, like cave systems. So, it will be largely a function of the depositional environment, I would guess.

I don't know of any studies that have quantified how frequently green fluorescence is encountered. Anecdotally, I have seen it several times.
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Josele




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PostPosted: Jun 06, 2012 17:45    Post subject: Re: Calcite green fluorescence activator  

Gneissware, thank you very much, in few words you accurately summarized the matter.
Just a data: I have calcites from about 30 different places and 7 localities shows fluorescence, mostly pink, some turns to yellow, and only one green. That gives more than 23% rate of fluo calcites.
To me, most fascinating thing is that a so small quantity of an element, not detectable with standard analysis, can provoke so showy effect.
Greetings.

Can see more pics here:
https://www.foro-minerales.com/forum/viewtopic.php?t=7665



sulphurC.JPG
 Description:
Calcite on sulphur
La Serrata (Maria de Cerrate), Lorca, Murcia, Spain
4 x 3,5 x 3,5 cm
With halogen lamp:
 Viewed:  11750 Time(s)

sulphurC.JPG



sulphurC_UV.JPG
 Description:
With LW UV LED:
 Viewed:  11765 Time(s)

sulphurC_UV.JPG



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Josele




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PostPosted: Jul 15, 2012 18:33    Post subject: Re: Calcite green fluorescence activator  

Some days ago I walked up to the quarry where these calcites come from. I picked up some samples and at home I was very surprised when check the fluorescence because the color: that one is pink.
After wait for a no moon night, yesterday at sunset I walk up again with camera, tripod and some LW UV LED flashlights. Is a very amazing quarry...
You can see a complete report here:
https://www.foro-minerales.com/forum/viewtopic.php?t=7867



C_karst11.jpg
 Description:
Karstic calcite
Baelo - Claudia Roman quarry, Tarifa, Cádiz, Spain.
18 x 10 x 10 cm
Under halogen lamp.
 Viewed:  11421 Time(s)

C_karst11.jpg



C_karst12.jpg
 Description:
Karstic calcite
Baelo - Claudia Roman quarry, Tarifa, Cádiz, Spain.
18 x 10 x 10 cm
Under LW UV LED:
 Viewed:  11470 Time(s)

C_karst12.jpg



P1090807.JPG
 Description:
Karstic calcite "in situ"
Baelo - Claudia Roman quarry, Tarifa, Cádiz, Spain.
FOV: 2,5 m
 Viewed:  11420 Time(s)

P1090807.JPG



P1090912.jpg
 Description:
Karstic calcite "in situ"
Baelo - Claudia Roman quarry, Tarifa, Cádiz, Spain.
Same wall under LW UV.
FOV: 3 m
 Viewed:  11403 Time(s)

P1090912.jpg



P1090913.jpg
 Description:
Karstic calcite "in situ"
Baelo - Claudia Roman quarry, Tarifa, Cádiz, Spain.
FOV: 1,5 m
Detail of the previous photo.
 Viewed:  11405 Time(s)

P1090913.jpg



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Josele




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PostPosted: Aug 07, 2012 16:50    Post subject: Re: Calcite green fluorescence activator  

This is another outcrop of same Roman quarry. Here we find some karstic calcite covered walls and also some sections showing inner aggregate structures and geodes.
Thanks for your comments, suggestions and information about fluorescence activators, any help to understand little bit more this phenomenon will be very appreciated.

Please, see a report of this outcrop here:
https://www.foro-minerales.com/forum/viewtopic.php?p=79916#79916

or, see a complete report of the quarry here:
https://www.foro-minerales.com/forum/viewtopic.php?t=7867



P1100079.JPG
 Description:
Karstic calcite "in situ" under LW UV LEDs.
Roman quarry, Tarifa, Cádiz, Spain.
FOV: 2 m
A fallen block of calcite partially green fluorescent against a wall covered by pink fluorescent calcite layer.
 Viewed:  11184 Time(s)

P1100079.JPG



P1090966_2.JPG
 Description:
Karstic calcite "in situ".
Roman quarry, Tarifa, Cádiz, Spain.
FOV: 1,2 m
Collapsed geode section with some smaller pockets with acute pyramidal calcite points, almost covered by blackish lichens.
 Viewed:  11177 Time(s)

P1090966_2.JPG



P1100080_2.JPG
 Description:
Karstic calcite "in situ" under LW UV LEDs.
Roman quarry, Tarifa, Cádiz, Spain.
FOV: 1,5 m
Same wall showing crystals with pink fluorescence and others with a green one.
 Viewed:  11172 Time(s)

P1100080_2.JPG



P1100077.JPG
 Description:
Karstic calcite "in situ" under LW UV LEDs.
Roman quarry, Tarifa, Cádiz, Spain.
FOV: 2 m
Please, help me adding a comment, I was speechless after this photo.
 Viewed:  11161 Time(s)

P1100077.JPG



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