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Post by stephan on Mar 29, 2015 21:46:09 GMT -5
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Post by Rockoonz on Mar 29, 2015 23:20:37 GMT -5
Youngite is fluorescent too. Fun stuff
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Fossilman
Cave Dweller 
Member since January 2009
Posts: 20,723 
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Post by Fossilman on Mar 29, 2015 23:35:11 GMT -5
Looking good........................
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timloco
has rocks in the head
Member since April 2012
Posts: 545
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Post by timloco on Mar 30, 2015 9:16:16 GMT -5
Youngite is fluorescent too. Fun stuff I've noticed a lot of the agate I've collected from northern CO is florescent, same with the Bahia agates I've purchased. I wonder is it's an agate thing, to fluoresce. Love this Youngite though that's a nice lookin' rock. |
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Post by stephan on Mar 30, 2015 9:49:18 GMT -5
Ah, yes. I forgot to mention the fluorescence.
I think the fluorescence thing is more related to impurities in the agate. Some Utah dino bone fluoresces as well, and I understand that it can be due to trace amount of uranium present in the stone.
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Post by snowmom on Mar 30, 2015 13:08:20 GMT -5
not something to wear close to your heart then... sure is beautiful stuff.
Love me a good breccia.
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Post by stephan on Mar 30, 2015 13:59:45 GMT -5
I think the amounts are so low, that exposure would be minimal, but one might want to check rad levels before wearing it.
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timloco
has rocks in the head
Member since April 2012
Posts: 545
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Post by timloco on Mar 30, 2015 14:48:17 GMT -5
I think the amounts are so low, that exposure would be minimal, but one might want to check rad levels before wearing it. yea whenever I've run my geiger counter over the agate that fluoresces it's not any higher than background. |
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Post by pauls on Mar 30, 2015 15:55:32 GMT -5
I have a feeling that the fluorescent Agates have tiny Calcite crystals in them that fluoresce. I have had a look and there are crystals of something.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Mar 30, 2015 20:48:56 GMT -5
I have a feeling that the fluorescent Agates have tiny Calcite crystals in them that fluoresce. I have had a look and there are crystals of something. Wrong color fluorescence. Its uranium as diagnosed by color emitted. |
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Post by stephan on Mar 31, 2015 9:47:22 GMT -5
Okay, this has gotten a bit off-track. My apologies. I guess I wasn't clear. I dis not mean to imply that Youngite contains uranium (I have no idea either way). I was just offering up uranium in Utah some rocks as an example of how impurities, rather than agate itself, are responsible for the fluorescence. Online pics seem to show Youngite as "glowing" blue and green, so the theory of calcite actually seems plausible (for the blue). I just checked with the following website: www.vaughns-1-pagers.com/science/fluorescent-mineral-colors.htmIt lists opal, uranium phosphate and zinc silicate as possible green emitters. Of these, zinc silicate seems most plausible, because the green emission comes from the white parts of the rock. U(PO4)2 would be yellow-green under white light. But in trace amount? Who knows. Again, it was only an example for another region. For the record, both uranium and zinc have been mined in Wyoming. |
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Post by braders on Mar 31, 2015 21:21:31 GMT -5
So far some of the material in Wyoming I've collected I noticed glow are.. Blue forest petwood. Blue in short wave a yellow to orange in long. Sweetwater agate green in short wave . Cedar mountain Opal , bright green in short mild Blue in long but host rock a peachy color. Youngite green in short wave and yellow to orange in long wave  Tried some calcite no glow on ether ?? Cheers.. |
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Post by 150FromFundy on Apr 1, 2015 15:46:08 GMT -5
Sometimes rocks are more complicated than necessary. Youngite is a local name for agate or jasper coated by druzy Quartz. In the case of fluorescent Youngite, the Quartz is actually Hyalite. Hyalite is a form of Opal with a glassy and clear appearance. That's a long-winded way of saying that fluorescent Youngite is actually Hyalite (Opal).
As suggested by a few members, Hyalite (Opal) glows bright green under shortwave fluorescent light. If you Google "fluorescent Youngite" you will see many glowing bright green photos (under SW light) along with the specimen photos under white light.
Darryl.
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