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florescent calcite

Posted by jennifer cindrich  
jennifer cindrich May 03, 2017 07:04PM
I have found fluorescent calcite in my yard. My question is is it common to get different fluorescing colors of calcite out of the same hole that I'm digging. Some pieces on the surface are bright orange. Some of the pieces florescence purple and some of the pieces florescence blue and some of them florescence all of the colors listed. They also are phosphorescent but some out of the same spot or more bright and last longer than others. I am in central Texas in the hill country in the Llano uplift.
Alexander Ringel May 03, 2017 08:55PM
It is common to get two different colors of fluorescence on one crystal. But 3 colors on one crystal are uncommon. Not rare but uncommon enough to keep and trade good pieces.
jennifer cindrich May 03, 2017 11:28PM
what if it has four different colors?
Paul Brandes May 04, 2017 01:43AM
jennifer cindrich Wrote:
> what if it has four different colors?

Calcite can come in a large range of fluorescent colours, it all depends on what activator(s) (impurities) are in it.
Also, it may not be all calcite. There are plenty of things in the Hill Country that fluoresce and could be mixed with the calcite.
Alexander Ringel May 04, 2017 02:01AM
4 Colors in a single crystal would be definitly rare. But there has to be excluded, that these colors are caused by other minerals, as Paul Brandes mentioned already. But specimens with multiple minerals and 4 colors of fluorescence or more are demanded by collectors aswell. Depending on intensity, color distribution and beauty of the fluorescence they can have a value. But to estimate this, there should be at least some photos.
Wayne Corwin May 04, 2017 03:36AM
The florescence purple may just be UV reflections.
jennifer cindrich May 04, 2017 12:26PM

jennifer cindrich May 04, 2017 12:29PM
Its a calcite/aragonite piece. My iphone camera isnt the greatest but the aragonite is a creamy yellow, the calcite is metallic blue, purple, and orange.
Alexander Ringel May 04, 2017 12:39PM
The last one has nice color combinations. The blue could be another mineral. Not really valuable but definitly a good addition for UV-Mineral collections. Swapping such for specimens of other localities should be easy. When the fluorescence is more intense and covers more of the surface, it becomes a bit valuable.
jennifer cindrich May 04, 2017 01:15PM
all the photos are the same specimen. its an 80# rock
Paul Brandes May 04, 2017 02:04PM
It might be the same specimen, but is it the same mineral throughout the specimen?
I believe that's where we're going with this....
jennifer cindrich May 04, 2017 02:25PM
I dont know Paul. How could I find out?
Bob Harman May 04, 2017 04:00PM
I, like PAUL B, have some doubt that your specimen is all calcite or aragonite/calcite. The third pix shows an area in the center of the specimen that looks more like chert or chalcedony with very sharp edges and pieces flaking off like flint would.

To help ID your specimen, put several drops of HCl on several areas of the example, including the area where I am concerned. If there is no fizzing, then your example, in that area, would neither be calcite nor aragonite. CHEERS......BOB

Edited 1 time(s). Last edit at 05/04/2017 04:03PM by Bob Harman.
jennifer cindrich May 05, 2017 01:14PM

it all fizzes
jennifer cindrich May 05, 2017 01:17PM
oops thats blurry

and yes, I acid washed the whole thing.
I like the ''look'.
Joel Dyer May 19, 2017 02:01PM
Hi Jennifer,

I had a look at one of your samples today (Sample2 Site3). In the circled area of one piece, there were minute, bright-red spots that were highly fluorescent (orange-red) and extremely luminescent under 532nm laser, even though I cut the power down to 25% of max.
The bright spots quickly dissolved in water, and the colour looked unnatural, so it looks like that might have been some synthetic contamination. The integration (=exposure) times in both photos are very short & longer exposures did not produce a decent ID spectrum for the possible contamination.

But, another piece I broke of from the same sample had pronounced bluish fluorescence (shown in the photo) and strong blue-white phosporescence that last about 7 seconds afer turning off the UV lamp.

Clearly, both pieces are calcite, but this is the first calcite I've handled that was phosphorescent. I don't know how many localities have phosporescent calcite, so don't know how common the phenomenum in calcite is.



Edited 4 time(s). Last edit at 05/20/2017 03:10PM by Joel Dyer.
Emil Box May 19, 2017 10:27PM
Phosphorescent calcite named in the Gleason-book:
Terlingua, Texas
Miami, Florida
Lovington, Deming, New Mexico
St. Andreasberg, Germany
Agrigento, Sicily
Lieber: Iberg, Winterberg, Germany. Green fluorescing calcite often phosphoresce.

jennifer cindrich May 20, 2017 12:12PM

I thank you for your hard work in confirming that the calcite piece is indeed calcite and the phosphorescence that it has.

It is very exciting to me to finally get confirmation on my find in my yard. I will keep digging and see what else I can find, as the color in the pieces I recover keep getting brighter yet!


Ed Clopton May 20, 2017 01:49PM
As described in another recent thread, I have specimens of calcite from Pint's quarry, Raymond, Iowa, and Moscow quarry, Moscow, Iowa that both fluoresce and phosphoresce. Sorry, but I have no technical info about the cause of the fluorescence/phosphorescence at those localities. The fluorite from Pint's is also strongly fluorescent and phosphorescent.

Edited 1 time(s). Last edit at 05/20/2017 01:51PM by Ed Clopton.
Wayne Corwin May 20, 2017 11:04PM

How deep have you dug so far?
jennifer cindrich May 21, 2017 11:59AM

About one foot- to a foot 1/2 deep.

Emil Box May 21, 2017 06:24PM
I made some measurements.
Green (greenish) fluorescent calcite that phosphoresce:
Rauris, Austria
Nuxis, Sardegna, Italy
Brandberg, Namibia
Lavrio, Greece (red fluorescing don't phosphoresce)
Dornap, Germany
Hagen-Halden, Germany
Orange fluorescing with phosphorescence:
Hildfeld, Germany
Gleason (1960):
Zins sulfide made phosphorescent with a trace of copper.
Dye solutions made phosphorescent with gelatin.
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