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UV MineralsAny ideas on the green fluorescent mineral?

21st May 2019 00:57 UTCBrian Fussell

Its a syenite rock with sodalite I found in WI on a beach of lake Michigan, I have many but a couple have some green fluorescent minerals like this one. Is it another feldspathoid possibly?

21st May 2019 03:36 UTCBob Harman

BRIAN,

The problem with this rock and your other posted rock and even your rock posted on JORDI FABRE's website under your name"FUSS", is that all the examples are water worn pebbles from a beach shore. They are all out of context. Where you found them is not where they originated. They may be remains of glacial erratics from hundreds, maybe thousands of miles away, then tossed and stream worn for millennia. Making educated guesses on these is very difficult as they are out of any context as to their true origin. Take all guesses, including mine, with a large grain of salt.

Enjoy your beach pebble collecting, but don't expect too much really definitive ids. CHEERS.....BOB

21st May 2019 04:55 UTCBrian Fussell

Yes I realize that, definitive ids are not expected based on my photos and descriptions, but educated guesses are are good enough for me to follow up on.

21st May 2019 09:05 UTCA. M.

Uranium / thorium containing minerals have this response, even a little could be fluorescent. Could be quartz included with uranium salts - or it could be meta-autunite...

21st May 2019 12:16 UTCHarold Moritz 🌟 Expert

Before considering the rare, the common stuff must be ruled out. In the white light photo, the green patch looks like microcline, which is very common in these rock types. Microcline can fluoresce light blue under SW UV. But secondly, is the color balance correct on your UV photo? The vast majority posted on the web are too blue because the camera sensors dont see the fluorescence the way we do. What wavelength is the UV light source? Green fluorescence like this is commonly caused by a coating of opal-AN, though I'd expect it to have worn off by the alluvial action that rounded this rock, it does appear to be in a little recess on the surface. But many organic coatings also fluoresce. I dont know what your collecting philosophy is regarding these finds, but as a geologist I will say you need to break it open to get an unweathered, unsullied surface to work with.

26th Jun 2020 06:32 UTCToruko Ishi

I'm not interested in U/V influence on minerals as that can has been kicked around for decades. While no expert in minerals generally I'm informed by studies that laser

stimulated differentiated fluorescence in speleothems present may display colors.

Colors only tell likes/dislikes in their geochemistry. Fluorescence is a contamination

of the crystal lattice. There appear to be a means other than sub-surface water to put fluorescent ions into growing mineral formations. When you boys and girls take a piece

outside the cave it begins a slow death. Loss of color and stained by your body oils.

Without y'all present bacteria and fungus certainly influence color. Red is said to be a reaction of iron oxidizing bacteria. As may unusual organic substances. Spectral analysis and lab' work is needed. Maybe U/V influence needs multi-spectral analysis ? "I'm just passing through." The Chronicles of Riddick

21st May 2019 18:52 UTCBrian Fussell

Thank you, good leads ill follow up on.

A. Mathauser Wrote:

-------------------------------------------------------

> Uranium / thorium containing minerals have this

> response, even a little could be fluorescent.

> Could be quartz included with uranium salts - or

> it could be meta-autunite...

21st May 2019 19:03 UTCBrian Fussell

Hi Harold, I do correct the images in photoshop to match what is seen with the eye the best I can, the green mineral is actually a bit more saturated looking in person than what is shown above. I used a convoy2 365nm filtered uv light. I only have a few of these that have the green fluorescent minerals in them and this one is the most distinct so I will leave this on intact for my fluorescent display shelf. I will look through my others and see if any of those are worth breaking apart.

Harold Moritz Wrote:

-------------------------------------------------------

> Before considering the rare, the common stuff must

> be ruled out. In the white light photo, the green

> patch looks like microcline, which is very common

> in these rock types. Microcline can fluoresce

> light blue under SW UV. But secondly, is the color

> balance correct on your UV photo? The vast

> majority posted on the web are too blue because

> the camera sensors dont see the fluorescence the

> way we do. What wavelength is the UV light source?

> Green fluorescence like this is commonly caused by

> a coating of opal-AN, though I'd expect it to have

> worn off by the alluvial action that rounded this

> rock, it does appear to be in a little recess on

> the surface. But many organic coatings also

> fluoresce. I dont know what your collecting

> philosophy is regarding these finds, but as a

> geologist I will say you need to break it open to

> get an unweathered, unsullied surface to work

> with.

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