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UV MineralsGreen fluorescing mineral in granite

15th Jan 2019 16:15 UTCBrian Fussell

Noticed by accident while looking at another fluorescent rock on my granite countertop...so i found this sample of the counter and photographed the rough untreated edge in 365 filtered LW. Any suggestions as to what the green minerals are?

15th Jan 2019 16:17 UTCBrian Fussell

More images.

15th Jan 2019 16:42 UTCAlfredo Petrov Manager

Could be secondary opal in tiny fissures, or some secondary uranium mineral.

15th Jan 2019 23:55 UTCPaul Brandes 🌟 Manager

Opal (hyalite) is not out of the realm of possibility in a granite, which would show up bright green using a LW lamp.

16th Jan 2019 00:58 UTCDoug Daniels

I thought hyalite fluoresced only under SW, and not LW. Shows how long its been since I used my lamp.

16th Jan 2019 01:11 UTCAlfredo Petrov Manager

Doug, Some will fluoresce under even longer wavelengths, like visible blue light. But you're right that SW brings out the effect more often.

16th Jan 2019 03:36 UTCCostas Constantinides

From the Mica Creek pegmatites in NW QLD -Australia comes this REE fluorite fluorescing yellow.(ID has been done) Any chance your specimen is a possibility of being fluorite..

16th Jan 2019 05:37 UTCBrian Fussell

I ran my SW light over it a minute ago, same (if not a tad more vibrant color green) result. Any suggestions on what test I should try next to figure out if it is Hyalite vs Uranium?

16th Jan 2019 05:39 UTCBrian Fussell

Doesn't Fluorite fluoresce blue instead of green?

Costas Constantinides Wrote:

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

> From the Mica Creek pegmatites in NW QLD

> -Australia comes this REE fluorite fluorescing

> yellow.(ID has been done) Any chance your

> specimen is a possibility of being fluorite..

>

>

16th Jan 2019 07:52 UTCWayne Corwin

Costas

yours looks like Manganapatite to me.

17th Jan 2019 06:47 UTCCostas Constantinides

Wayne - I had the mineral tested by as learned a person (IMA) you could wish for. The location carries monazite and a lot of small amounts of some scarce pegmatite minerals..Apparently the yellow fluorescence in fluorite is rare ,but does exist.See the photo with test and a site to see article on fluorite fluorescence..

24th Jan 2019 21:54 UTCHarald Stehlik

The green color and that it is granite, point to Uranyl-activated green fluorescence (which is best seen in short wave, but often also in long wave UV.)

24th Jan 2019 23:02 UTCJosé Zendrera 🌟 Manager

There is no scale in the excellent fuss's photos but the rock could be a pegmatite. In this case hyalite would be more likely.

25th Jan 2019 14:16 UTCAlfred L. Ostrander

Fuss,

In answer to your question regarding the presence of hyalite vs uranium, if it is hyalite it is also uranium. Let me explain. Your specimen appears to be granite. It need not be specifically a pegmatite granite. The hyalite can occur in granite regardless of grain size. The hyalite is a secondary mineral that will appear in any opening in the rock. Yours appears to be in small openings. It can also appear on large surfaces along large cracks in the rock. Here is the "also" part. The cause of the fluorescence in the hyalite is the presence of the uranyl cation UO2 that Harald correctly noted. So, what you have is the uranyl cation in the hyalite. This is a common association well known to collectors of fluorescent minerals.

I cannot see any little yellow or yellowish green mineral specks in your photo under daylight. That strongly suggests the absence of another uranium mineral such as autunite that also fluoresces. Hyalite is most often colorless, allowing small amounts to "hide out" in the granite and the uranyl to "hide out" in the hyalite.

I hope this helps bring things together to more fully answer your questions.

27th Jan 2019 21:23 UTCBrian Fussell

José Zendrera Wrote:

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

> There is no scale in the excellent fuss's photos

> but the rock could be a pegmatite. In this case

> hyalite would be more likely.

Jose, the width of the sample in the first two images is roughly 1 inch. Thx much.

27th Jan 2019 21:29 UTCBrian Fussell

Thank you Alfred, it does most certainly help with my questions.

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