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#26

Heatho
Moderator
From: Sydney, NSW
Joined: 29 April 2013
Posts: 8,000
Moderator
05 December 2016 06:11 pm

goldierocks wrote:

The problem is that people buy a torch and shine it on a particular mineral and it fluoresces and say "great, it works well" - but they don't realise that it is of limited range of wavelength that doesn't work for other minerals. Anyway, good luck.

I did when I bought my torch, it was specifically for rubies and diamonds that flouresce. Though since giving it a go on some opal I've noticed mild flourescence as well.


Minelab GPX 5000, SDC2300, CTX3030, Pro-Find-25, patience, lot's of patience.

#27

goldierocks
Member
Joined: 10 January 2015
Posts: 240
Member
05 December 2016 07:29 pm

http://www.ultraviolet-tools.com/ultavi … -lamp.html

This one is $US62 including postage and a pair of their UV safety glasses


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

#28

goldierocks
Member
Joined: 10 January 2015
Posts: 240
Member
05 December 2016 07:32 pm

MODERATOR - yes, I mentioned elsewhere that precious opal varies a lot, and a UV plant re-works the dumps at Coober Pedy (where most opal fluoresces). Less than half fluoresces at Lightning Ridge.


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

#29

Heatho
Moderator
From: Sydney, NSW
Joined: 29 April 2013
Posts: 8,000
Moderator
05 December 2016 07:39 pm

Most of the precious stuff I've tried it on has a bit of flourescence, plus fire opal from I think from South America and the amber nobbies from Lightning ridge my mate gave me show a bit also.


Minelab GPX 5000, SDC2300, CTX3030, Pro-Find-25, patience, lot's of patience.

#30

goldierocks
Member
Joined: 10 January 2015
Posts: 240
Member
05 December 2016 08:12 pm

It is the problem with fluorescence - often the fluorescence is not caused by the elements that comprise the mineral, but by traces of other elements that it contains (eg in the sense that ruby and sapphire are corundum Al2O3, but what causes the fluorescence is the trace Cr that gives ruby its red colour (or Mn I think for blue sapphire). And of course precious opal doesn't have any colour at all (one is seeing refraction of light around the opal spheres as in a rainbow, as you probably know). I am not sure why so many fluoresce, and I wondered if it might be oil or something between the spheres - some are full of bacterial forms.


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

1 user likes this post: silver

#31

Heatho
Moderator
From: Sydney, NSW
Joined: 29 April 2013
Posts: 8,000
Moderator
06 December 2016 08:56 am

I am quite well aware of the spheres in opal and traces of Cr in ruby which give these gems their colour, it's also traces of iron in rubies from certain areas that stop them from flourescing. When I go out gold detecting with my mates from Lightning Ridge we sit around for hours after detecting talking about gemstones and minerals. smile

It's titanium and iron that make sapphires blue.

I'm not sure why so many opals flouresce either, it could very well be the bacteria that make it happen. Interesting theory that one. Maybe even some sort of mildly radioactive elememnts? Sort of like the way uranium glass flouresces?


Minelab GPX 5000, SDC2300, CTX3030, Pro-Find-25, patience, lot's of patience.

#32

goldierocks
Member
Joined: 10 January 2015
Posts: 240
Member
11 December 2016 02:09 pm

Not sure about uranium Heatho but it is a thought - it is a bit elevated in opal


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

1 user likes this post: Heatho

#33

B5MECH
Member
From: Sydney, NSW
Joined: 25 January 2016
Posts: 1,197
Member
20 December 2016 02:59 pm

Damn, got my torch today which has beat other chinese c#$p I'm waiting on
I miss understood the listing slightly roll ops from looking at too many lol lol
Thought it came with a cradle for AAA's as well, but no needs a 18650 battery mad roll lol on the hunt roll
Sorry wishfull ops it looks sweet but will get back with a on pic soon
http://www.ebay.com.au/itm/271717052714 … EBIDX%3AIT
New I should have got the kit with batt and charger roll
1482206269_aaaa_001.jpg
Maybe this one$15.95 yikes

Last edited by B5MECH (20 December 2016 03:18 pm)


Garrett At Gold, Garrett gravity trap gold pan kit, Makro Racer 2, Makro Pointer.

#34

B5MECH
Member
From: Sydney, NSW
Joined: 25 January 2016
Posts: 1,197
Member
20 December 2016 04:08 pm

Or I might just buy this which has the battery and AAA cage
http://www.ebay.com.au/itm/291856317167 … EBIDX%3AIT
fake x800 torch lol lol Aussie seller

Last edited by B5MECH (20 December 2016 04:09 pm)


Garrett At Gold, Garrett gravity trap gold pan kit, Makro Racer 2, Makro Pointer.

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