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Post by oregon on Mar 30, 2022 22:48:36 GMT -5
Utah Petrified wood makes me think one must be getting close to Arizona. Shining my UV flashlight at the bucket was quite a surprise. There are some bright green and orange fluorescences. I borrowed an analytic Geiger counter thinking Utah and Uranium... alas, there is no appreciable radioactivity above normal background. Anyone know what minerals, components might be responsible for the fluorescence? |
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RWA3006
Cave Dweller 
Member since March 2009
Posts: 4,612 
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Post by RWA3006 on Mar 30, 2022 23:52:13 GMT -5
Now that's just awesome! I'll bet 1dave can "illuminate" our understanding on this subject. |
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Post by 1dave on Mar 31, 2022 7:31:08 GMT -5
My first guess for green was autunite, chalcedony and opal, calcite for orange, but it has been a long time since I played with that fun stuff.
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Post by liveoak on Mar 31, 2022 11:41:00 GMT -5
Interestingly I just got an e-mail form Rock & Gem with an article on:
Not necessarily only on petrified wood, but interesting just the same.
Patty
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Post by oregon on Mar 31, 2022 12:02:18 GMT -5
As there's no discernible radioactivity, I don't think there's any Uranium involved, Guessing maybe a Mn compound, sorta like old glass bottles?
It's nice agatized wood. Doesn't seem to be any opal or calcite. It'll make lovely tumbles to shine a UV light at.
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Post by jasoninsd on Mar 31, 2022 19:32:03 GMT -5
The "reason" behind the fluorescence isn't something I'd know squat about...however, I can say those look amazing!!  |
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Post by oregon on Mar 31, 2022 21:34:19 GMT -5
Uranium Mineralization of Fossil Wood
Sounds like some of the opal from Virgin Valley fits the bill, but This really doesn't look/feel opal to me. No radioactivity...
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,612
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Post by RWA3006 on Mar 31, 2022 22:14:18 GMT -5
oregon that is one of the most interesting articles I've read in a while. I need to go dig my blacklight out of the camper and start checking my Virgin Valley opal and southern Utah wood.
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Post by 1dave on Apr 1, 2022 8:13:54 GMT -5
Uranium Mineralization of Fossil Wood Sounds like some of the opal from Virgin Valley fits the bill, but This really doesn't look/feel opal to me. No radioactivity... Thanks for this! |
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