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Offline GoldDigger1950Topic starter
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« on: July 17, 2011, 04:42:52 pm »
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When heated, certain crystals emit light. When they cool and you reheat, they do not emit light. Find out why in this article and see how it can help you determine your site is worth more effort.

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http://www.tinaja.com/ebooks/tlum.pdf


Another brilliant article by Don Lancaster.

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« Reply #1 on: July 17, 2011, 11:37:52 pm »
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And if you apply a flame to limestone it will burn with a brillant white light.  This was used in music halls of the past, hence the term "in the limelight."

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« Reply #2 on: July 18, 2011, 11:09:20 am »
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They use that method here in the South West to determine how long a Object has been underground.  

They Test it and the Ground Above it.

Some how they can determine the difference of Absorbed Solar Radiation between the two.

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« Reply #3 on: July 19, 2011, 06:06:22 pm »
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Great article.Thanks! Of particular interest to me is the reaction of talc in volcanos (which is mainly where I stomp around these days). That got me thinking this heating clue may be of use to determine if a particular geologic structure or area was once part of a volcano. And that gives rise to more questions....what about presence of talc which did not have volcanic origins? And can I do this in my kitchen with simple heating methods and eyeballing it as I don't happen to have a thermoluminescence analyzer in my left pocket?

BTW nice factoid about the lime light, Gramps. I never knew that.

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« Reply #4 on: July 19, 2011, 06:37:49 pm »
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I would think you could probably do something similar.  Get a sacrificial pan, probably cast iron, scrub it good to get the results of previous sacrificial rites. Wink  Put it on stove, put in powder, turn stove on low to allow pan to heat slowly, turn out the lights.  Now wait for the light show, if it don't happen well so much for my science abilities.   Wise

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P.S.  make sure you have plenty of ventilation just in case it makes some nasty aromatics.

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« Reply #5 on: July 19, 2011, 07:07:39 pm »
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Yeah Gramps...sounds like it's worth a shot. And yes, plenty of ventilation is a must! Have just skimmed thru the article and will study in depth later on...just noticed it's dated March 1969.

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« Reply #6 on: July 19, 2011, 07:25:17 pm »
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if you have a little propane type campstove you could do it outside where there is beaucoup ventilation.  just put the powder in the pan, set the burner to low, put pan on and wait for the luminescence.

I don't know if this would matter but considering that recently deposited volcanic ash has already been heated and might not give the desired show.  Just my weary old grey cells wandering whilst I sip my Rooibos Carmel tea.

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« Reply #7 on: July 19, 2011, 08:52:54 pm »
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gd, interesting article. Crystal defects are useful to science.

Hobbyist, Talc volcano? where do they occur. Is the lava talc or does talc form after the lava lays around a while?

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« Reply #8 on: July 19, 2011, 09:18:45 pm »
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Gambol1,

The talc Hobbyist is talking about is the ash that you see billowing up in coverage of volcanos erupting in explosive events.  I was stationed here on the Oregon coast when Mt. St. Helens came to life in 1980.  On the first eruption everything went east, the second time the winds were going westward and we here on the coast got dusted.  The ash is very fine and also very abrasive, the first time I mowed my lawn after the dusting and some rain (we get a lot here) I had the sharpen my mower blade twice just to do my backyard.

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« Reply #9 on: July 19, 2011, 10:05:41 pm »
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Hi Gambol1. In the article's table 1, Volcanoes and talc are mentioned in the list of thermoluminescent materials.
No Gramps, I wasn't referring to volcanic ash at all. Talc is a kind of mineral, and does not necessarily occur in fine powder form.

In some volcanoes, serpentine metamorphizes to talc from the interaction of seawater with hot gabbroic intrusions. I have found lumps of serpentine before in river beds (some are pretty big).

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